Fix PinchViewport::visibleRectInDocument

Source/core/frame/PinchViewport.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 128 matching lines @@
 {
     return FloatRect(location(), visibleSize());
 }
 
 FloatRect PinchViewport::visibleRectInDocument() const
 {
     if (!mainFrame() || !mainFrame()->view())
         return FloatRect();
 
     FloatPoint viewLocation = FloatPoint(mainFrame()->view()->scrollableArea()->scrollPositionDouble());
-    FloatRect pinchRect = visibleRect();
-    pinchRect.moveBy(viewLocation);
-    return pinchRect;
+    return FloatRect(viewLocation, visibleSize());
 }
 
 FloatRect PinchViewport::mainViewToViewportCSSPixels(const FloatRect& rect) const
 {
     // Note, this is in CSS Pixels so we don't apply scale.
     FloatRect rectInViewport = rect;
     rectInViewport.moveBy(-location());
     return rectInViewport;
 }
 
@@ skipping 490 matching lines @@
     } else if (graphicsLayer == m_rootTransformLayer) {
         name =  "Root Transform Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace blink