[Mojo] Fix race condition in sample_app's SwapBuffers

mojo/services/gles2/gles2_impl.h

 // Copyright 2013 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 MOJO_SERVICES_GLES2_GLES2_IMPL_H_
 #define MOJO_SERVICES_GLES2_GLES2_IMPL_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "mojo/public/bindings/lib/remote_ptr.h"
 #include "mojo/public/system/core_cpp.h"
 #include "mojom/gles2.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/size.h"
 
 namespace gpu {
 class GLInProcessContext;
 }
 
 namespace mojo {
 namespace services {
 
 class GLES2Impl : public GLES2Stub {
  public:
   explicit GLES2Impl(ScopedMessagePipeHandle client);
   virtual ~GLES2Impl();
 
-  virtual void SwapBuffers() OVERRIDE;
+  virtual void Destroy() OVERRIDE;
 
   void CreateContext(gfx::AcceleratedWidget widget, const gfx::Size& size);
 
  private:
   void OnGLContextLost();
 
   scoped_ptr<gpu::GLInProcessContext> gl_context_;
   RemotePtr<GLES2Client> client_;
 
   DISALLOW_COPY_AND_ASSIGN(GLES2Impl);
 };
 
 }  // namespace services
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_GLES2_GLES2_IMPL_H_