[Refactor] Cache the views::Widget* that the FrameMaximizeButton acts on

ash/wm/custom_frame_view_ash.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 "ash/wm/custom_frame_view_ash.h"
 
 #include "ash/wm/caption_buttons/frame_caption_button_container_view.h"
 #include "ash/wm/frame_painter.h"
 #include "grit/ash_resources.h"
 #include "ui/base/resource/resource_bundle.h"
@@ skipping 35 matching lines @@
 
 void CustomFrameViewAsh::Init(views::Widget* frame) {
   frame_ = frame;
 
   // Unfortunately, there is no views::WidgetDelegate::CanMinimize(). Assume
   // that the window frame can be minimized if it can be maximized.
   FrameCaptionButtonContainerView::MinimizeAllowed minimize_allowed =
       frame_->widget_delegate()->CanMaximize() ?
           FrameCaptionButtonContainerView::MINIMIZE_ALLOWED :
           FrameCaptionButtonContainerView::MINIMIZE_DISALLOWED;
-  caption_button_container_ = new FrameCaptionButtonContainerView(this, frame,
+  caption_button_container_ = new FrameCaptionButtonContainerView(frame,
       minimize_allowed);
   AddChildView(caption_button_container_);
 
   frame_painter_->Init(frame_, NULL, caption_button_container_);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // CustomFrameViewAsh, views::NonClientFrameView overrides:
 gfx::Rect CustomFrameViewAsh::GetBoundsForClientView() const {
   int top_height = NonClientTopBorderHeight();
@@ skipping 91 matching lines @@
   if (frame_->IsFullscreen())
     return 0;
 
   // Reserve enough space to see the buttons, including any offset from top and
   // reserving space for the separator line.
   return caption_button_container_->bounds().bottom() +
       frame_painter_->HeaderContentSeparatorSize();
 }
 
 }  // namespace ash