MacViews: Clear mouse handler when showing context menus.

chrome/browser/ui/views/toolbar/toolbar_button.cc

 // Copyright 2013 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 "chrome/browser/ui/views/toolbar/toolbar_button.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 215 matching lines @@
   ignore_result(menu_runner_->RunMenuAt(
       GetWidget(), nullptr, gfx::Rect(menu_position, gfx::Size(0, 0)),
       views::MENU_ANCHOR_TOPLEFT, source_type));
 }
 
 void ToolbarButton::OnMenuClosed() {
   AnimateInkDrop(views::InkDropState::DEACTIVATED, nullptr /* event */);
 
   menu_showing_ = false;
 
-  // Need to explicitly clear mouse handler so that events get sent
-  // properly after the menu finishes running. If we don't do this, then
-  // the first click to other parts of the UI is eaten.
-  SetMouseHandler(nullptr);
-
   // Set the state back to normal after the drop down menu is closed.
   if (state() != STATE_DISABLED)
     SetState(STATE_NORMAL);
 
   menu_runner_.reset();
   menu_model_adapter_.reset();
 }
 
 const char* ToolbarButton::GetClassName() const {
   return "ToolbarButton";
 }