Convert scroll offsets to use SyncedProperty.

cc/trees/layer_tree_impl.h

Index: cc/trees/layer_tree_impl.h
diff --git a/cc/trees/layer_tree_impl.h b/cc/trees/layer_tree_impl.h
index e68bbc36f086c7ac1c1d5e5c58b88e87f1adf95a..f7f58ed4278459a2a29acda774b9e2796adb6dae 100644
--- a/cc/trees/layer_tree_impl.h
+++ b/cc/trees/layer_tree_impl.h
@@ -135,7 +135,6 @@ class CC_EXPORT LayerTreeImpl {
   LayerImpl* OuterViewportScrollLayer() const;
   gfx::ScrollOffset TotalScrollOffset() const;
   gfx::ScrollOffset TotalMaxScrollOffset() const;
-  gfx::Vector2dF TotalScrollDelta() const;
 
   LayerImpl* InnerViewportContainerLayer() const;
   LayerImpl* OuterViewportContainerLayer() const;
@@ -153,7 +152,6 @@ class CC_EXPORT LayerTreeImpl {
   }
   LayerImpl* page_scale_layer() { return page_scale_layer_; }
   void ApplySentScrollAndScaleDeltasFromAbortedCommit();
-  void ApplyScrollDeltasSinceBeginMainFrame();
 
   SkColor background_color() const { return background_color_; }
   void set_background_color(SkColor color) { background_color_ = color; }