Fix state management of transform feedback buffers.

third_party/WebKit/Source/modules/webgl/WebGLSharedObject.h

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 30 matching lines @@
   WebGLContextGroup* ContextGroup() const { return context_group_; }
 
   virtual bool IsBuffer() const { return false; }
   virtual bool IsProgram() const { return false; }
   virtual bool IsQuery() const { return false; }
   virtual bool IsRenderbuffer() const { return false; }
   virtual bool IsSampler() const { return false; }
   virtual bool IsShader() const { return false; }
   virtual bool IsSync() const { return false; }
   virtual bool IsTexture() const { return false; }
-  virtual bool IsTransformFeedback() const { return false; }
 
   bool Validate(const WebGLContextGroup* context_group,
                 const WebGLRenderingContextBase*) const final;
 
   DECLARE_VIRTUAL_TRACE();
 
   DECLARE_VIRTUAL_TRACE_WRAPPERS();
 
  protected:
   explicit WebGLSharedObject(WebGLRenderingContextBase*);
 
   bool HasGroupOrContext() const final { return context_group_; }
 
   uint32_t CurrentNumberOfContextLosses() const final;
 
   gpu::gles2::GLES2Interface* GetAGLInterface() const final;
 
  private:
   TraceWrapperMember<WebGLContextGroup> context_group_;
 };
 
 }  // namespace blink
 
 #endif  // WebGLSharedObject_h