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

ui/views/test/test_views.h

Index: ui/views/test/test_views.h
diff --git a/ui/views/test/test_views.h b/ui/views/test/test_views.h
index 7501a810045612fef61e65b955e11a1934779b8b..7d0cabf6c8ae1d5dc5104bf89eecfe88a2217ca9 100644
--- a/ui/views/test/test_views.h
+++ b/ui/views/test/test_views.h
@@ -15,7 +15,7 @@ class StaticSizedView : public View {
   explicit StaticSizedView(const gfx::Size& size);
   virtual ~StaticSizedView();
 
-  virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual gfx::Size GetPreferredSize() const OVERRIDE;
 
  private:
   gfx::Size size_;
@@ -29,7 +29,7 @@ class ProportionallySizedView : public View {
   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.