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

ui/gl/angle_platform_impl.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_ANGLE_PLATFORM_IMPL_H_
 #define UI_GL_ANGLE_PLATFORM_IMPL_H_
 
 // Implements the ANGLE platform interface, for functionality like
 // histograms and trace profiling.
 
 #include "base/macros.h"
 #include "third_party/angle/include/platform/Platform.h"
 
-namespace gfx {
+namespace gl {
 
 // Derives the base ANGLE platform and provides implementations
 class ANGLEPlatformImpl : public angle::Platform {
  public:
   ANGLEPlatformImpl();
   ~ANGLEPlatformImpl() override;
 
   // angle::Platform:
   double currentTime() override;
   double monotonicallyIncreasingTime() override;
@@ skipping 22 matching lines @@
   void histogramEnumeration(const char* name,
                             int sample,
                             int boundary_value) override;
   void histogramSparse(const char* name, int sample) override;
   void histogramBoolean(const char* name, bool sample) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ANGLEPlatformImpl);
 };
 
-}  // namespace gfx
+}  // namespace gl
 
 #endif  // UI_GL_ANGLE_PLATFORM_IMPL_H_