Migrate most of cc/ from WebKit::WebTransformationMatrix to gfx::Transform

cc/layer_tree_host_impl.h

Index: cc/layer_tree_host_impl.h
diff --git a/cc/layer_tree_host_impl.h b/cc/layer_tree_host_impl.h
index 0aa250d685d0bd7e0601474c653111a85bff5faf..fcbc3dac37ee9f59a167766e1ed8b80421eecc8a 100644
--- a/cc/layer_tree_host_impl.h
+++ b/cc/layer_tree_host_impl.h
@@ -93,7 +93,7 @@ public:
     // this constraint.
     gfx::Vector2dF applyScroll(const gfx::Vector2dF&);
 
-    WebKit::WebTransformationMatrix implTransform(bool pageScalePinchZoomEnabled) const;
+    gfx::Transform implTransform(bool pageScalePinchZoomEnabled) const;
 
 private:
     float m_pageScaleFactor;
@@ -220,7 +220,7 @@ public:
     void setPageScaleFactorAndLimits(float pageScaleFactor, float minPageScaleFactor, float maxPageScaleFactor);
 
     scoped_ptr<ScrollAndScaleSet> processScrollDeltas();
-    WebKit::WebTransformationMatrix implTransform() const;
+    gfx::Transform implTransform() const;
 
     void startPageScaleAnimation(gfx::Vector2d targetOffset, bool useAnchor, float scale, base::TimeDelta duration);