Move code in ui/gl/* from gfx:: to gl::

ui/gl/scoped_api.cc

 // 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 gfx {
+namespace gl {
 
 ScopedSetGLToRealGLApi::ScopedSetGLToRealGLApi()
     : old_gl_api_(GetCurrentGLApi()) {
   SetGLToRealGLApi();
 }
 
 ScopedSetGLToRealGLApi::~ScopedSetGLToRealGLApi() {
   SetGLApi(old_gl_api_);
 }
 
-}  // namespace gfx
+}  // namespace gl