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

ui/gl/gl_context_osmesa.cc

 // Copyright (c) 2012 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/gl_context_osmesa.h"
 
 #include <GL/osmesa.h>
 
 #include "base/logging.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_surface.h"
 
-namespace gfx {
+namespace gl {
 
 GLContextOSMesa::GLContextOSMesa(GLShareGroup* share_group)
     : GLContextReal(share_group),
       context_(nullptr),
       is_released_(false) {
 }
 
 bool GLContextOSMesa::Initialize(GLSurface* compatible_surface,
                                  GpuPreference gpu_preference) {
   DCHECK(!context_);
@@ skipping 118 matching lines @@
 }
 
 void GLContextOSMesa::OnSetSwapInterval(int interval) {
   DCHECK(IsCurrent(nullptr));
 }
 
 GLContextOSMesa::~GLContextOSMesa() {
   Destroy();
 }
 
-}  // namespace gfx
+}  // namespace gl