Merge revision 655 changes:

- Windows: Delay destroying the browser window until pending drag operations have completed (issue #610).
- Revert: Windows: Reset the window procedure in the WebWidgetHost destructor to avoid crashes if messages are delivered after the window is destroyed.

git-svn-id: https://chromiumembedded.googlecode.com/svn/branches/1025@656 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/webwidget_host_win.cc

@@ -358,7 +358,6 @@ WebWidgetHost::~WebWidgetHost() {
 
   if (view_) {
     ui::SetWindowUserData(view_, 0);
-    ui::SetWindowProc(view_, DefWindowProc);
     view_ = NULL;
   }
 }