views: Make view::Views::GetPreferredSize() const.

ui/views/test/test_views.h

 // 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.
 
 #ifndef UI_VIEWS_TEST_TEST_VIEWS_H_
 #define UI_VIEWS_TEST_TEST_VIEWS_H_
 
 #include "ui/views/view.h"
 
 namespace views {
 
 // A view that requests a set amount of space.
 class StaticSizedView : public View {
  public:
   explicit StaticSizedView(const gfx::Size& size);
   virtual ~StaticSizedView();
 
-  virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual gfx::Size GetPreferredSize() const OVERRIDE;
 
  private:
   gfx::Size size_;
 
   DISALLOW_COPY_AND_ASSIGN(StaticSizedView);
 };
 
 // A view that accomodates testing layouts that use GetHeightForWidth.
 class ProportionallySizedView : public View {
  public:
   explicit ProportionallySizedView(int factor);
   virtual ~ProportionallySizedView();
 
-  virtual int GetHeightForWidth(int w) OVERRIDE;
+  virtual int GetHeightForWidth(int w) const OVERRIDE;
 
  private:
   // The multiplicative factor between width and height, i.e.
   // height = width * factor_.
   int factor_;
 
   DISALLOW_COPY_AND_ASSIGN(ProportionallySizedView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_TEST_TEST_VIEWS_H_