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

ui/gl/gpu_timing_fake.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/gpu_timing_fake.h"
 
 #include "base/time/time.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gl/gl_mock.h"
 
-namespace gfx {
+namespace gl {
 
 using ::testing::_;
 using ::testing::AtLeast;
 using ::testing::AtMost;
 using ::testing::Exactly;
 using ::testing::Invoke;
 using ::testing::NotNull;
 using ::testing::DoAll;
 using ::testing::Return;
 using ::testing::SetArgPointee;
@@ skipping 266 matching lines @@
       break;
     default:
       FAIL() << "Invalid variable passed to GetIntegerv: " << pname;
   }
 }
 
 GLenum GPUTimingFake::FakeGLGetError() {
   return GL_NO_ERROR;
 }
 
-}  // namespace gfx
+}  // namespace gl