Change namespace from ui to gfx for NativePixmap related code

ui/gfx/native_pixmap.h

 // Copyright 2014 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_GFX_NATIVE_PIXMAP_H_
 #define UI_GFX_NATIVE_PIXMAP_H_
 
 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "ui/gfx/buffer_types.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/native_pixmap_handle.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/overlay_transform.h"
 
 namespace gfx {
 class Rect;
 class RectF;
-}
-
-namespace ui {
 
 // This represents a buffer that can be directly imported via GL for
 // rendering, or exported via dma-buf fds.
 class NativePixmap : public base::RefCountedThreadSafe<NativePixmap> {
  public:
   NativePixmap() {}
 
   virtual void* /* EGLClientBuffer */ GetEGLClientBuffer() const = 0;
   virtual bool AreDmaBufFdsValid() const = 0;
   virtual size_t GetDmaBufFdCount() const = 0;
@@ skipping 37 matching lines @@
 
  protected:
   virtual ~NativePixmap() {}
 
  private:
   friend class base::RefCountedThreadSafe<NativePixmap>;
 
   DISALLOW_COPY_AND_ASSIGN(NativePixmap);
 };
 
-}  // namespace ui
+}  // namespace gfx
 
 #endif  // UI_GFX_NATIVE_PIXMAP_H_