Change grow box computation back to a method on BrowserWindow

content/public/browser/render_view_host_delegate.h

Index: content/public/browser/render_view_host_delegate.h
diff --git a/content/public/browser/render_view_host_delegate.h b/content/public/browser/render_view_host_delegate.h
index 9d543e9d45eee0fb17ca3d92828c55b298365220..1f0ad49cd14bbbecbdfa225302848cf74c43dba8 100644
--- a/content/public/browser/render_view_host_delegate.h
+++ b/content/public/browser/render_view_host_delegate.h
@@ -203,6 +203,10 @@ class CONTENT_EXPORT RenderViewHostDelegate : public IPC::Channel::Listener {
   // Return type of RenderView which is attached with this object.
   virtual content::ViewType GetRenderViewType() const = 0;
 
+  // Return the rect where to display the resize corner, if any, otherwise
+  // an empty rect.
+  virtual gfx::Rect GetRootWindowResizerRect() const = 0;
+
   // The RenderView is being constructed (message sent to the renderer process
   // to construct a RenderView).  Now is a good time to send other setup events
   // to the RenderView.  This precedes any other commands to the RenderView.