MacViews: Clear mouse handler when showing context menus.

ui/views/controls/combobox/combobox.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/combobox/combobox.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 929 matching lines @@
   menu_runner_->RunMenuAt(GetWidget(), nullptr, bounds, anchor_position,
                           source_type);
 }
 
 void Combobox::OnMenuClosed(Button::ButtonState original_button_state) {
   menu_runner_.reset();
   menu_model_adapter_.reset();
   if (arrow_button_)
     arrow_button_->SetState(original_button_state);
   closed_time_ = base::Time::Now();
-
-  // 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(NULL);
 }
 
 void Combobox::OnPerformAction() {
   NotifyAccessibilityEvent(ui::AX_EVENT_VALUE_CHANGED, false);
   SchedulePaint();
 
   // This combobox may be deleted by the listener.
   base::WeakPtr<Combobox> weak_ptr = weak_ptr_factory_.GetWeakPtr();
   if (listener_)
     listener_->OnPerformAction(this);
@@ skipping 32 matching lines @@
   const int kMdPaddingWidth = 8;
   int arrow_pad = UseMd() ? kMdPaddingWidth
                           : PlatformStyle::kComboboxNormalArrowPadding;
   int padding = style_ == STYLE_NORMAL
                     ? arrow_pad * 2
                     : kActionLeftPadding + kActionRightPadding;
   return ArrowSize().width() + padding;
 }
 
 }  // namespace views