Revert 158362 - Support high DPI scrollbar on top level web frame.

cc/CCLayerImpl.cpp

Index: cc/CCLayerImpl.cpp
===================================================================
--- cc/CCLayerImpl.cpp	(revision 158385)
+++ cc/CCLayerImpl.cpp	(working copy)
@@ -224,15 +224,6 @@
     return CCInputHandlerClient::ScrollStarted;
 }
 
-IntRect CCLayerImpl::layerRectToContentRect(const WebKit::WebRect& layerRect)
-{
-    float widthScale = static_cast<float>(contentBounds().width()) / bounds().width();
-    float heightScale = static_cast<float>(contentBounds().height()) / bounds().height();
-    FloatRect contentRect(layerRect.x, layerRect.y, layerRect.width, layerRect.height);
-    contentRect.scale(widthScale, heightScale);
-    return enclosingIntRect(contentRect);
-}
-
 std::string CCLayerImpl::indentString(int indent)
 {
     std::string str;