[Mac] Enable "Edit Search Engines" in Omnibox context menu.

chrome/browser/cocoa/autocomplete_text_field_editor.mm

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/cocoa/autocomplete_text_field_editor.h"
 
 #include "app/l10n_util_mac.h"
 #include "base/string_util.h"
 #include "grit/generated_resources.h"
 #include "base/sys_string_conversions.h"
+#include "chrome/app/chrome_dll_resource.h"  // IDC_*
 #import "chrome/browser/cocoa/autocomplete_text_field.h"
 
 @implementation AutocompleteTextFieldEditor
 
 - (void)copy:(id)sender {
   NSPasteboard* pb = [NSPasteboard generalPasteboard];
   [self performCopy:pb];
 }
 
 - (void)cut:(id)sender {
@@ skipping 72 matching lines @@
   if ([self isEditable]) {
     // Paste and go/search.
     AutocompleteTextFieldObserver* observer = [self observer];
     DCHECK(observer);
     if (observer && observer->CanPasteAndGo()) {
       const int string_id = observer->GetPasteActionStringId();
       NSString* label = l10n_util::GetNSStringWithFixup(string_id);
 
       // TODO(rohitrao): If the clipboard is empty, should we show a
       // greyed-out "Paste and Go" or nothing at all?
-      if (label) {
+      if ([label length]) {
         [menu addItemWithTitle:label
                         action:@selector(pasteAndGo:)
                  keyEquivalent:@""];
       }
+
+      label = l10n_util::GetNSStringWithFixup(IDS_EDIT_SEARCH_ENGINES);
+      DCHECK([label length]);
+      if ([label length]) {
+        [menu addItem:[NSMenuItem separatorItem]];
+        NSMenuItem* item = [menu addItemWithTitle:label
+                                           action:@selector(commandDispatch:)
+                                    keyEquivalent:@""];
+        [item setTag:IDC_EDIT_SEARCH_ENGINES];
+      }
     }
   }
 
   return menu;
 }
 
 @end