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

chrome/browser/ui/views/fullscreen_exit_bubble_views.cc

Index: chrome/browser/ui/views/fullscreen_exit_bubble_views.cc
diff --git a/chrome/browser/ui/views/fullscreen_exit_bubble_views.cc b/chrome/browser/ui/views/fullscreen_exit_bubble_views.cc
index 53e5e37efda130919d434ed384791494f5dc06fe..a664f5cf394c5372f79563afec4e4d0203915f1d 100644
--- a/chrome/browser/ui/views/fullscreen_exit_bubble_views.cc
+++ b/chrome/browser/ui/views/fullscreen_exit_bubble_views.cc
@@ -48,7 +48,7 @@ class ButtonView : public views::View {
   virtual ~ButtonView();
 
   // Returns an empty size when the view is not visible.
-  virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual gfx::Size GetPreferredSize() const OVERRIDE;
 
   views::LabelButton* accept_button() const { return accept_button_; }
   views::LabelButton* deny_button() const { return deny_button_; }
@@ -81,7 +81,7 @@ ButtonView::ButtonView(views::ButtonListener* listener,
 ButtonView::~ButtonView() {
 }
 
-gfx::Size ButtonView::GetPreferredSize() {
+gfx::Size ButtonView::GetPreferredSize() const {
   return visible() ? views::View::GetPreferredSize() : gfx::Size();
 }