Do not set touch region on PageOverlay layer.

Source/web/PageOverlay.cpp

 /*
  * Copyright (C) 2011 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:
  *
  * 1. Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *
@@ skipping 104 matching lines @@
     invalidateWebFrame();
 
     if (!m_layer) {
         m_layerClient = OverlayGraphicsLayerClientImpl::create(m_overlay);
         m_layer = GraphicsLayer::create(m_viewImpl->graphicsLayerFactory(), m_layerClient.get());
         m_layer->setDrawsContent(true);
 
         if (WebCore::Page* page = m_viewImpl->page())
             page->inspectorController().willAddPageOverlay(m_layer.get());
 
-        // Compositor hit-testing does not know how to deal with layers that may be
-        // transparent to events (see http://crbug.com/269598). So require
-        // scrolling and touches on this layer to go to the main thread.
+        // This is required for contents of overlay to stay in sync with the page while scrolling.
         WebLayer* platformLayer = m_layer->platformLayer();
         platformLayer->setShouldScrollOnMainThread(true);
-        WebVector<WebRect> webRects(static_cast<size_t>(1));
-        webRects[0] = WebRect(0, 0, INT_MAX, INT_MAX);
-        platformLayer->setTouchEventHandlerRegion(webRects);
     }
 
     FloatSize size(m_viewImpl->size());
     if (size != m_layer->size()) {
         // Triggers re-adding to root layer to ensure that we are on top of
         // scrollbars.
         m_layer->removeFromParent();
         m_layer->setSize(size);
     }
 
@@ skipping 20 matching lines @@
         // this is not on a critical codepath? In order to do so, we'd
         // have to take scrolling into account.
         const WebSize& size = m_viewImpl->size();
         WebRect damagedRect(0, 0, size.width, size.height);
         if (m_viewImpl->client())
             m_viewImpl->client()->didInvalidateRect(damagedRect);
     }
 }
 
 } // namespace blink