Remove new-style-dropdown mixin

app/assets/stylesheets/framework/dropdowns.scss

@@ -760,11 +760,6 @@
   }
 }
 
-// TODO: change global style and remove mixin
-@mixin new-style-dropdown($selector: '') {
-
-}
-
 @media (max-width: $screen-xs-max) {
   .navbar-gitlab {
     li.header-projects,
@@ -791,9 +786,6 @@
   }
 }
 
-@include new-style-dropdown('.breadcrumbs-list .dropdown ');
-@include new-style-dropdown('.js-namespace-select + ');
-
 header.header-content .dropdown-menu.projects-dropdown-menu {
   padding: 0;
 }

app/assets/stylesheets/framework/header.scss

@@ -3,8 +3,6 @@
 }
 
 .navbar-gitlab {
-  @include new-style-dropdown;
-
   &.navbar-gitlab {
     padding: 0 16px;
     z-index: 1000;

app/assets/stylesheets/framework/lists.scss

@@ -132,8 +132,6 @@ ul.content-list {
     }
 
     .controls {
-      @include new-style-dropdown;
-
       float: right;
 
       > .control-text {

app/assets/stylesheets/framework/secondary-navigation-elements.scss

@@ -86,8 +86,6 @@
   }
 
   .nav-controls {
-    @include new-style-dropdown;
-
     display: inline-block;
     float: right;
     text-align: right;

app/assets/stylesheets/framework/sidebar.scss

@@ -139,10 +139,6 @@
   }
 }
 
-.issuable-sidebar {
-  @include new-style-dropdown;
-}
-
 .pikaday-container {
   .pika-single {
     margin-top: 2px;

app/assets/stylesheets/framework/typography.scss

@@ -343,8 +343,6 @@ a > code {
   @extend .ref-name;
 }
 
-@include new-style-dropdown('.git-revision-dropdown');
-
 /**
  * Apply Markdown typography
  *

app/assets/stylesheets/pages/builds.scss

@@ -323,8 +323,6 @@
   }
 
   .build-dropdown {
-    @include new-style-dropdown;
-
     margin: $gl-padding 0;
     padding: 0;
 

app/assets/stylesheets/pages/clusters.scss

@@ -13,8 +13,6 @@
   max-width: 100%;
 }
 
-@include new-style-dropdown('.clusters-dropdown ');
-
 .clusters-container {
   .nav-bar-right {
     padding: $gl-padding-top $gl-padding;

app/assets/stylesheets/pages/cycle_analytics.scss

 #cycle-analytics {
-  @include new-style-dropdown;
-
   max-width: 1000px;
   margin: 24px auto 0;
   position: relative;

app/assets/stylesheets/pages/detail_page.scss

@@ -32,8 +32,6 @@
 }
 
 .detail-page-header-actions {
-  @include new-style-dropdown;
-
   align-self: center;
   flex-shrink: 0;
   flex: 0 0 auto;

app/assets/stylesheets/pages/diff.scss

@@ -581,8 +581,6 @@
   }
 
   .commit-stat-summary {
-    @include new-style-dropdown;
-
     @media (min-width: $screen-sm-min) {
       margin-left: -$gl-padding;
       padding-left: $gl-padding;

app/assets/stylesheets/pages/editor.scss

@@ -204,8 +204,6 @@
   .gitlab-ci-yml-selector,
   .dockerfile-selector,
   .template-type-selector {
-    @include new-style-dropdown;
-
     display: inline-block;
     vertical-align: top;
     font-family: $regular_font;

app/assets/stylesheets/pages/environments.scss

@@ -12,8 +12,6 @@
 
 .environments-container {
   .ci-table {
-    @include new-style-dropdown;
-
     .deployment-column {
       > span {
         word-break: break-all;

app/assets/stylesheets/pages/issuable.scss

@@ -487,12 +487,6 @@
     }
   }
 
-  .dropdown-content {
-    a:hover {
-      color: inherit;
-    }
-  }
-
   .dropdown-menu-toggle {
     width: 100%;
     padding-top: 6px;
@@ -511,10 +505,6 @@
   }
 }
 
-.sidebar-move-issue-dropdown {
-  @include new-style-dropdown;
-}
-
 .sidebar-move-issue-confirmation-button {
   width: 100%;
 

app/assets/stylesheets/pages/issues.scss

@@ -142,8 +142,6 @@ ul.related-merge-requests > li {
 }
 
 .issue-form {
-  @include new-style-dropdown;
-
   .select2-container {
     width: 250px !important;
   }

app/assets/stylesheets/pages/labels.scss

@@ -116,8 +116,6 @@
 }
 
 .manage-labels-list {
-  @include new-style-dropdown;
-
   > li:not(.empty-message):not(.is-not-draggable) {
     background-color: $white-light;
     cursor: move;

app/assets/stylesheets/pages/members.scss

@@ -73,8 +73,6 @@
 }
 
 .member-search-form {
-  @include new-style-dropdown;
-
   position: relative;
 
   @media (min-width: $screen-sm-min) {

app/assets/stylesheets/pages/merge_requests.scss

@@ -485,8 +485,6 @@
 }
 
 .mr-source-target {
-  @include new-style-dropdown;
-
   display: flex;
   flex-wrap: wrap;
   justify-content: space-between;
@@ -608,8 +606,6 @@
 }
 
 .mr-version-controls {
-  @include new-style-dropdown;
-
   position: relative;
   background: $gray-light;
   color: $gl-text-color;
@@ -727,7 +723,3 @@
     font-size: 16px;
   }
 }
-
-.merge-request-form {
-  @include new-style-dropdown;
-}

app/assets/stylesheets/pages/note_form.scss

@@ -23,8 +23,6 @@
 .new-note,
 .note-edit-form {
   .note-form-actions {
-    @include new-style-dropdown;
-
     position: relative;
     margin: $gl-padding 0 0;
   }

app/assets/stylesheets/pages/notes.scss

@@ -490,8 +490,6 @@ ul.notes {
 }
 
 .note-actions {
-  @include new-style-dropdown;
-
   align-self: flex-start;
   flex-shrink: 0;
   display: inline-flex;

app/assets/stylesheets/pages/notifications.scss

@@ -14,7 +14,3 @@
     font-size: 18px;
   }
 }
-
-.notification-form {
-  @include new-style-dropdown;
-}

app/assets/stylesheets/pages/pipelines.scss

@@ -286,8 +286,6 @@
 
 // Pipeline visualization
 .pipeline-actions {
-  @include new-style-dropdown;
-
   border-bottom: 0;
 }
 
@@ -703,9 +701,6 @@ button.mini-pipeline-graph-dropdown-toggle {
   }
 }
 
-@include new-style-dropdown('.big-pipeline-graph-dropdown-menu');
-@include new-style-dropdown('.mini-pipeline-graph-dropdown-menu');
-
 // dropdown content for big and mini pipeline
 .big-pipeline-graph-dropdown-menu,
 .mini-pipeline-graph-dropdown-menu {

app/assets/stylesheets/pages/projects.scss

@@ -323,8 +323,6 @@
 }
 
 .project-repo-buttons {
-  @include new-style-dropdown;
-
   .project-action-button .dropdown-menu {
     max-height: 250px;
     overflow-y: auto;
@@ -898,8 +896,6 @@ pre.light-well {
 
 .new-protected-branch,
 .new-protected-tag {
-  @include new-style-dropdown;
-
   label {
     margin-top: 6px;
     font-weight: $gl-font-weight-normal;
@@ -919,8 +915,6 @@ pre.light-well {
 
 .protected-branches-list,
 .protected-tags-list {
-  @include new-style-dropdown;
-
   margin-bottom: 30px;
 
   .settings-message {

app/assets/stylesheets/pages/search.scss

@@ -185,8 +185,6 @@ input[type="checkbox"]:hover {
 }
 
 .search-holder {
-  @include new-style-dropdown;
-
   @media (min-width: $screen-sm-min) {
     display: -webkit-flex;
     display: flex;

app/assets/stylesheets/pages/todos.scss

@@ -265,7 +265,3 @@
     font-weight: $gl-font-weight-bold;
   }
 }
-
-.todos-filters {
-  @include new-style-dropdown;
-}

app/assets/stylesheets/pages/tree.scss

 .tree-holder {
-  @include new-style-dropdown;
-
   .nav-block {
     margin: 10px 0;