Cleanup: remove GTK stuff

ui/views/controls/menu/menu_runner.cc

 // Copyright (c) 2012 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.
 
 #include "ui/views/controls/menu/menu_runner.h"
 
 #include <set>
 
 #include "ui/views/controls/button/menu_button.h"
 #include "ui/views/controls/menu/menu_controller.h"
@@ skipping 222 matching lines @@
     menu_->GetDelegate()->ExecuteCommand(result->GetCommand(),
                                          mouse_event_flags);
   }
   return MenuRunner::NORMAL_EXIT;
 }
 
 bool MenuRunnerImpl::ShouldShowMnemonics(MenuButton* button) {
   // Show mnemonics if the button has focus or alt is pressed.
   bool show_mnemonics = button ? button->HasFocus() : false;
 #if defined(OS_WIN)
-  // We don't currently need this on gtk as showing the menu gives focus to the
-  // button first.
+  // This is only needed on Windows.
   if (!show_mnemonics)
     show_mnemonics = base::win::IsAltPressed();
 #endif
   return show_mnemonics;
 }
 
 }  // namespace internal
 
 MenuRunner::MenuRunner(MenuItemView* menu)
     : holder_(new internal::MenuRunnerImpl(menu)) {
@@ skipping 17 matching lines @@
 
 bool MenuRunner::IsRunning() const {
   return holder_->running();
 }
 
 void MenuRunner::Cancel() {
   holder_->Cancel();
 }
 
 }  // namespace views