cc: Move ownership of surfaces to SurfaceManager

cc/surfaces/compositor_frame_sink_support.h

Index: cc/surfaces/compositor_frame_sink_support.h
diff --git a/cc/surfaces/compositor_frame_sink_support.h b/cc/surfaces/compositor_frame_sink_support.h
index 4397a140918c87bbf993bc592c0476957d2ccc79..b030e9d9045c411f617003eb12b2fe37659e1723 100644
--- a/cc/surfaces/compositor_frame_sink_support.h
+++ b/cc/surfaces/compositor_frame_sink_support.h
@@ -99,8 +99,7 @@ class CC_SURFACES_EXPORT CompositorFrameSinkSupport
   void OnBeginFrameSourcePausedChanged(bool paused) override;
 
   void UpdateNeedsBeginFramesInternal();
-  std::unique_ptr<Surface> CreateSurface(const SurfaceInfo& surface_info);
-  void DestroyCurrentSurface();
+  base::WeakPtr<Surface> CreateSurface(const SurfaceInfo& surface_info);
 
   CompositorFrameSinkSupportClient* const client_;
 
@@ -115,7 +114,8 @@ class CC_SURFACES_EXPORT CompositorFrameSinkSupport
 
   SurfaceResourceHolder surface_resource_holder_;
 
-  std::unique_ptr<Surface> current_surface_;
+  base::WeakPtr<Surface> current_surface_;
+
   // Counts the number of CompositorFrames that have been submitted and have not
   // yet received an ACK.
   int ack_pending_count_ = 0;