Couple of fixes for DesktopWindowTreeHostMus.

ui/views/bubble/bubble_frame_view.h

 // 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.
 
 #ifndef UI_VIEWS_BUBBLE_BUBBLE_FRAME_VIEW_H_
 #define UI_VIEWS_BUBBLE_BUBBLE_FRAME_VIEW_H_
 
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
@@ skipping 62 matching lines @@
   void SetBubbleBorder(std::unique_ptr<BubbleBorder> border);
 
   gfx::Insets content_margins() const { return content_margins_; }
 
   void SetFootnoteView(View* view);
 
   // Given the size of the contents and the rect to point at, returns the bounds
   // of the bubble window. The bubble's arrow location may change if the bubble
   // does not fit on the monitor and |adjust_if_offscreen| is true.
   gfx::Rect GetUpdatedWindowBounds(const gfx::Rect& anchor_rect,
-                                   gfx::Size client_size,
+                                   const gfx::Size& client_size,
                                    bool adjust_if_offscreen);
 
   bool close_button_clicked() const { return close_button_clicked_; }
 
   Button* GetCloseButtonForTest() { return close_; }
 
  protected:
   // Returns the available screen bounds if the frame were to show in |rect|.
   virtual gfx::Rect GetAvailableScreenBounds(const gfx::Rect& rect) const;
 
@@ skipping 38 matching lines @@
 
   // Whether the close button was clicked.
   bool close_button_clicked_;
 
   DISALLOW_COPY_AND_ASSIGN(BubbleFrameView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_BUBBLE_BUBBLE_FRAME_VIEW_H_