Remove m_layerTreeView from WebViewImpl.

sky/engine/public/platform/WebLayerTreeView.h

Index: sky/engine/public/platform/WebLayerTreeView.h
diff --git a/sky/engine/public/platform/WebLayerTreeView.h b/sky/engine/public/platform/WebLayerTreeView.h
index 2bec4adfe280709045e03ae22c1827884f36efa0..e03e45606ec9bc42f7c91e70a83d37544c871614 100644
--- a/sky/engine/public/platform/WebLayerTreeView.h
+++ b/sky/engine/public/platform/WebLayerTreeView.h
@@ -97,10 +97,6 @@ public:
     // Relays the end of a fling animation.
     virtual void didStopFlinging() { }
 
-    // The caller is responsible for keeping the WebCompositeAndReadbackAsyncCallback
-    // object alive until it is called.
-    virtual void compositeAndReadbackAsync(WebCompositeAndReadbackAsyncCallback*) { }
-
     // Blocks until the most recently composited frame has finished rendering on the GPU.
     // This can have a significant performance impact and should be used with care.
     virtual void finishAllRendering() = 0;
@@ -108,10 +104,6 @@ public:
     // Prevents updates to layer tree from becoming visible.
     virtual void setDeferCommits(bool deferCommits) { }
 
-    // Take responsiblity for this layer's animations, even if this layer hasn't yet
-    // been added to the tree.
-    virtual void registerForAnimations(WebLayer* layer) { }
-
     // Identify key layers to the compositor when using the pinch virtual viewport.
     virtual void registerViewportLayers(
         const WebLayer* pageScaleLayerLayer,