Revert of cc: Make tile manager object persist for the length of LTHI.

cc/trees/layer_tree_host_impl.h

Index: cc/trees/layer_tree_host_impl.h
diff --git a/cc/trees/layer_tree_host_impl.h b/cc/trees/layer_tree_host_impl.h
index 2c75512347cfd8f5920352f2c8656fbc94a4c9d5..2206bdf38f8d66f6f7951866906d1750248f1bd4 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -265,7 +265,7 @@
   void ScrollOffsetAnimationFinished() override;
   gfx::ScrollOffset GetScrollOffsetForAnimation(int layer_id) const override;
 
-  virtual bool PrepareTiles();
+  virtual void PrepareTiles();
 
   // Returns DRAW_SUCCESS unless problems occured preparing the frame, and we
   // should try to avoid displaying the frame. If PrepareToDraw is called,
@@ -617,8 +617,8 @@
       const gfx::Vector2dF& viewport_delta);
 
   void CreateAndSetRenderer();
-  void CleanUpTileManager();
-  void CreateTileManagerResources();
+  void CreateAndSetTileManager();
+  void DestroyTileManager();
   void ReleaseTreeResources();
   void RecreateTreeResources();