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

ui/gl/scoped_api.h

Index: ui/gl/scoped_api.h
diff --git a/ui/gl/scoped_api.h b/ui/gl/scoped_api.h
deleted file mode 100644
index 4d35f3d84753586b51fb07c41365623b5b186eb6..0000000000000000000000000000000000000000
--- a/ui/gl/scoped_api.h
+++ /dev/null
@@ -1,28 +0,0 @@
-// 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 UI_GL_SCOPED_API_H_
-#define UI_GL_SCOPED_API_H_
-
-#include "base/macros.h"
-#include "ui/gl/gl_export.h"
-
-namespace gl {
-
-class GLApi;
-
-class GL_EXPORT ScopedSetGLToRealGLApi {
- public:
-  ScopedSetGLToRealGLApi();
-  ~ScopedSetGLToRealGLApi();
-
- private:
-  GLApi* old_gl_api_;
-
-  DISALLOW_COPY_AND_ASSIGN(ScopedSetGLToRealGLApi);
-};
-
-}  // namespace gl
-
-#endif  // UI_GL_SCOPED_API_H_