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

ui/views/bubble/bubble_frame_view.h

Index: ui/views/bubble/bubble_frame_view.h
diff --git a/ui/views/bubble/bubble_frame_view.h b/ui/views/bubble/bubble_frame_view.h
index 6521343e767391e0e2f1a78223c65c683668a851..4d56032dff93b1243c96a42985873f2d63991311 100644
--- a/ui/views/bubble/bubble_frame_view.h
+++ b/ui/views/bubble/bubble_frame_view.h
@@ -45,8 +45,8 @@ class VIEWS_EXPORT BubbleFrameView : public NonClientFrameView,
 
   // View overrides:
   virtual gfx::Insets GetInsets() const OVERRIDE;
-  virtual gfx::Size GetPreferredSize() OVERRIDE;
-  virtual gfx::Size GetMinimumSize() OVERRIDE;
+  virtual gfx::Size GetPreferredSize() const OVERRIDE;
+  virtual gfx::Size GetMinimumSize() const OVERRIDE;
   virtual void Layout() OVERRIDE;
   virtual const char* GetClassName() const OVERRIDE;
   virtual void ChildPreferredSizeChanged(View* child) OVERRIDE;
@@ -90,7 +90,7 @@ class VIEWS_EXPORT BubbleFrameView : public NonClientFrameView,
                               const gfx::Size& client_size);
 
   // Calculates the size needed to accommodate the given client area.
-  gfx::Size GetSizeForClientSize(const gfx::Size& client_size);
+  gfx::Size GetSizeForClientSize(const gfx::Size& client_size) const;
 
   // The bubble border.
   BubbleBorder* bubble_border_;