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

chrome/browser/cocoa/autocomplete_text_field_editor.mm

Index: chrome/browser/cocoa/autocomplete_text_field_editor.mm
diff --git a/chrome/browser/cocoa/autocomplete_text_field_editor.mm b/chrome/browser/cocoa/autocomplete_text_field_editor.mm
index 8bb2e8a0b95a15ba681b55a7621f0b1422d91a54..35c707ec96adbbe0c5707b410ca24ae0b84b2f0d 100644
--- a/chrome/browser/cocoa/autocomplete_text_field_editor.mm
+++ b/chrome/browser/cocoa/autocomplete_text_field_editor.mm
@@ -8,6 +8,7 @@
 #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
@@ -100,11 +101,21 @@
 
       // 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];
+      }
     }
   }