Refactor GL bindings so there is no global GLApi or DriverGL.

gpu/command_buffer/service/gl_context_mock.h

 // Copyright 2015 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 GPU_COMMAND_BUFFER_SERVICE_GL_CONTEXT_MOCK_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GL_CONTEXT_MOCK_H_
 
 #include "testing/gmock/include/gmock/gmock.h"
-#include "ui/gl/gl_context_stub_with_extensions.h"
+#include "ui/gl/gl_context_stub.h"
 
 namespace gpu {
 
-class GLContextMock : public gl::GLContextStubWithExtensions {
+class GLContextMock : public gl::GLContextStub {
  public:
   GLContextMock();
 
   MOCK_METHOD1(MakeCurrent, bool(gl::GLSurface* surface));
 
  protected:
   virtual ~GLContextMock();
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GL_CONTEXT_MOCK_H_