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

ui/gl/scoped_api.cc

Index: ui/gl/scoped_api.cc
diff --git a/ui/gl/scoped_api.cc b/ui/gl/scoped_api.cc
deleted file mode 100644
index 99e92da452858406eb79f6ce93bc27f7e81cb13f..0000000000000000000000000000000000000000
--- a/ui/gl/scoped_api.cc
+++ /dev/null
@@ -1,20 +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.
-
-#include "ui/gl/scoped_api.h"
-
-#include "ui/gl/gl_gl_api_implementation.h"
-
-namespace gl {
-
-ScopedSetGLToRealGLApi::ScopedSetGLToRealGLApi()
-    : old_gl_api_(GetCurrentGLApi()) {
-  SetGLToRealGLApi();
-}
-
-ScopedSetGLToRealGLApi::~ScopedSetGLToRealGLApi() {
-  SetGLApi(old_gl_api_);
-}
-
-}  // namespace gl