Get rid of the EnableClose() infrastructure in Widget.

chrome/browser/ui/views/constrained_window_views.cc

Index: chrome/browser/ui/views/constrained_window_views.cc
===================================================================
--- chrome/browser/ui/views/constrained_window_views.cc	(revision 111086)
+++ chrome/browser/ui/views/constrained_window_views.cc	(working copy)
@@ -164,7 +164,6 @@
   virtual int NonClientHitTest(const gfx::Point& point) OVERRIDE;
   virtual void GetWindowMask(const gfx::Size& size, gfx::Path* window_mask)
       OVERRIDE;
-  virtual void EnableClose(bool enable) OVERRIDE;
   virtual void ResetWindowControls() OVERRIDE {}
   virtual void UpdateWindowIcon() OVERRIDE {}
 
@@ -350,10 +349,6 @@
   views::GetDefaultWindowMask(size, window_mask);
 }
 
-void ConstrainedWindowFrameView::EnableClose(bool enable) {
-  close_button_->SetEnabled(enable);
-}
-
 ////////////////////////////////////////////////////////////////////////////////
 // ConstrainedWindowFrameView, views::View implementation: