Don't navigate to about:blank

This turned out to prevent the browser from clearing the local storage.
Signed-off-by: Rémy Coutable <remy@rymai.me>

spec/support/wait_for_requests.rb

@@ -3,7 +3,6 @@ module WaitForRequests
 
   # This is inspired by http://www.salsify.com/blog/engineering/tearing-capybara-ajax-tests
   def wait_for_requests_complete
-    stop_client
     Gitlab::Testing::RequestBlockerMiddleware.block_requests!
     wait_for('pending AJAX requests complete') do
       Gitlab::Testing::RequestBlockerMiddleware.num_active_requests.zero?
@@ -12,13 +11,6 @@ module WaitForRequests
     Gitlab::Testing::RequestBlockerMiddleware.allow_requests!
   end
 
-  # Navigate away from the current page which will prevent any new requests from being started
-  def stop_client
-    page.execute_script %Q{
-      window.location = "about:blank";
-    }
-  end
-
   # Waits until the passed block returns true
   def wait_for(condition_name, max_wait_time: Capybara.default_max_wait_time, polling_interval: 0.01)
     wait_until = Time.now + max_wait_time.seconds