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

ui/gl/gpu_timing_fake.h

 // 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_GPU_TIMING_FAKE_H_
 #define UI_GL_GPU_TIMING_FAKE_H_
 
 #include <stdint.h>
 
 #include <map>
 #include <set>
 
 #include "ui/gl/gl_bindings.h"
 
-namespace gfx {
+namespace gl {
 class MockGLInterface;
 
 class GPUTimingFake {
  public:
   GPUTimingFake();
   ~GPUTimingFake();
 
   void Reset();
 
   // Used to set the current GPU time queries will return.
@@ skipping 52 matching lines @@
 
     void Reset() {
       active_ = false;
       query_id_ = 0;
       begin_time_ = 0;
     }
   };
   ElapsedQuery current_elapsed_query_;
 };
 
-}  // namespace gfx
+}  // namespace gl
 
 #endif  // UI_GL_GPU_TIMING_FAKE_H_