cmd/fix: remove os.Wait gofix.

The os.Wait function has been removed entirely, so there's no point in fixing code that called it.

R=r
CC=golang-dev
https://golang.org/cl/5685078

doc/go1.html

@@ -1465,9 +1465,7 @@ the <code>Process</code> type persists.
 
 <p>
 <em>Updating</em>:
-Gofix will rewrite calls to <code>os.Wait</code> with an explicit zero
-argument, dropping the argument.
-All other changes will be caught by the compiler and must be updated by hand.
+All changes will be caught by the compiler and must be updated by hand.
 </p>
 
 <h4 id="os_fileinfo">The os.FileInfo type</h4>

doc/go1.tmpl

@@ -1368,9 +1368,7 @@ the <code>Process</code> type persists.
 
 <p>
 <em>Updating</em>:
-Gofix will rewrite calls to <code>os.Wait</code> with an explicit zero
-argument, dropping the argument.
-All other changes will be caught by the compiler and must be updated by hand.
+All changes will be caught by the compiler and must be updated by hand.
 </p>
 
 <h4 id="os_fileinfo">The os.FileInfo type</h4>

src/cmd/fix/oswait.go

-// Copyright 2011 The Go Authors.  All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package main
-
-import (
-	"go/ast"
-)
-
-func init() {
-	register(oswaitFix)
-}
-
-var oswaitFix = fix{
-	"oswait",
-	"2012-02-20",
-	oswait,
-	`Delete options from os.Wait. If the option is the literal 0, rewrite the call.
-
-http://codereview.appspot.com/5688046
-`,
-}
-
-func oswait(f *ast.File) bool {
-	if !imports(f, "os") {
-		return false
-	}
-
-	fixed := false
-
-	walk(f, func(n interface{}) {
-		call, ok := n.(*ast.CallExpr)
-		if !ok {
-			return
-		}
-		if !isPkgDot(call.Fun, "os", "Wait") {
-			return
-		}
-		args := call.Args
-		const warning = "call to Process.Wait must be fixed manually"
-		if len(args) != 1 {
-			// Shouldn't happen, but check.
-			warn(call.Pos(), warning)
-			return
-		}
-		if basicLit, ok := args[0].(*ast.BasicLit); !ok || basicLit.Value != "0" {
-			warn(call.Pos(), warning)
-			return
-		}
-		call.Args = nil
-		fixed = true
-	})
-
-	return fixed
-}

src/cmd/fix/oswait_test.go

-// Copyright 2011 The Go Authors.  All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package main
-
-func init() {
-	addTestCases(oswaitTests, oswait)
-}
-
-var oswaitTests = []testCase{
-	{
-		Name: "oswait.0",
-		In: `package main
-
-import (
-	"os"
-)
-
-func f() {
-	os.Wait()
-	os.Wait(0)
-	os.Wait(1)
-	os.Wait(A | B)
-}
-`,
-		Out: `package main
-
-import (
-	"os"
-)
-
-func f() {
-	os.Wait()
-	os.Wait()
-	os.Wait(1)
-	os.Wait(A | B)
-}
-`,
-	},
-}