Correctly update size when a plugin has a transform.

Source/core/rendering/RenderWidget.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2006, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 104 matching lines @@
     return widget->frameRect().size() != newFrame.size();
 }
 
 bool RenderWidget::updateWidgetGeometry()
 {
     Widget* widget = this->widget();
     ASSERT(widget);
 
     LayoutRect contentBox = contentBoxRect();
     LayoutRect absoluteContentBox(localToAbsoluteQuad(FloatQuad(contentBox)).boundingBox());
-    if (widget->isFrameView()) {
+    if (widget->isFrameView() || widget->isPluginContainer()) {
         contentBox.setLocation(absoluteContentBox.location());
         return setWidgetGeometry(contentBox);
     }
 
     return setWidgetGeometry(absoluteContentBox);
 }
 
 void RenderWidget::layout()
 {
     ASSERT(needsLayout());
@@ skipping 179 matching lines @@
 CursorDirective RenderWidget::getCursor(const LayoutPoint& point, Cursor& cursor) const
 {
     if (widget() && widget()->isPluginView()) {
         // A plug-in is responsible for setting the cursor when the pointer is over it.
         return DoNotSetCursor;
     }
     return RenderReplaced::getCursor(point, cursor);
 }
 
 } // namespace WebCore