TextureLayer: clear texture id when clearing client

cc/layers/texture_layer.h

 // Copyright 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_LAYERS_TEXTURE_LAYER_H_
 #define CC_LAYERS_TEXTURE_LAYER_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 11 matching lines @@
 class CC_EXPORT TextureLayer : public Layer {
  public:
   // If this texture layer requires special preparation logic for each frame
   // driven by the compositor, pass in a non-nil client. Pass in a nil client
   // pointer if texture updates are driven by an external process.
   static scoped_refptr<TextureLayer> Create(TextureLayerClient* client);
 
   // Used when mailbox names are specified instead of texture IDs.
   static scoped_refptr<TextureLayer> CreateForMailbox();
 
-  void ClearClient() { client_ = NULL; }
+  void ClearClient();
 
   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
       OVERRIDE;
 
   // Sets whether this texture should be Y-flipped at draw time. Defaults to
   // true.
   void SetFlipped(bool flipped);
 
   // Sets a UV transform to be used at draw time. Defaults to (0, 0) and (1, 1).
   void SetUV(gfx::PointF top_left, gfx::PointF bottom_right);
@@ skipping 54 matching lines @@
 
   unsigned texture_id_;
   TextureMailbox texture_mailbox_;
   bool own_mailbox_;
 
   DISALLOW_COPY_AND_ASSIGN(TextureLayer);
 };
 
 }  // namespace cc
 #endif  // CC_LAYERS_TEXTURE_LAYER_H_