Remove codes related to scaling in GraphicsLayer tree.

Source/WebKit/chromium/tests/GraphicsLayerChromiumTest.cpp

 /*
  * Copyright (C) 2012 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.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 32 matching lines @@
 
 using namespace WebCore;
 using namespace WebKit;
 
 namespace {
 
 class MockGraphicsLayerClient : public GraphicsLayerClient {
   public:
     virtual void notifyAnimationStarted(const GraphicsLayer*, double time) OVERRIDE { }
     virtual void paintContents(const GraphicsLayer*, GraphicsContext&, GraphicsLayerPaintingPhase, const IntRect& inClip) OVERRIDE { }
-    virtual float deviceScaleFactor() const OVERRIDE { return 2; }
 };
 
 class GraphicsLayerChromiumTest : public testing::Test {
 public:
     GraphicsLayerChromiumTest()
     {
         m_graphicsLayer = adoptPtr(new GraphicsLayerChromium(&m_client));
         m_platformLayer = m_graphicsLayer->platformLayer();
         m_layerTreeView = adoptPtr(Platform::current()->unitTestSupport()->createLayerTreeViewForTesting(WebUnitTestSupport::TestViewTypeUnitTest));
         ASSERT(m_layerTreeView);
@@ skipping 85 matching lines @@
     EXPECT_FALSE(m_graphicsLayer->contentsLayer());
 
     m_graphicsLayer->setContentsToSolidColor(Color::white);
     EXPECT_TRUE(m_graphicsLayer->contentsLayer());
 
     m_graphicsLayer->setContentsToSolidColor(Color());
     EXPECT_FALSE(m_graphicsLayer->contentsLayer());
 }
 
 } // namespace