Change namespace from ui to gfx for NativePixmap related code

ui/ozone/platform/drm/gpu/gbm_buffer.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_OZONE_PLATFORM_DRM_GPU_GBM_BUFFER_H_
 #define UI_OZONE_PLATFORM_DRM_GPU_GBM_BUFFER_H_
 
 #include <vector>
 
 #include "base/files/scoped_file.h"
@@ skipping 64 matching lines @@
   uint32_t format_;
   uint32_t flags_;
   std::vector<base::ScopedFD> fds_;
   gfx::Size size_;
 
   std::vector<gfx::NativePixmapPlane> planes_;
 
   DISALLOW_COPY_AND_ASSIGN(GbmBuffer);
 };
 
-class GbmPixmap : public NativePixmap {
+class GbmPixmap : public gfx::NativePixmap {
  public:
   GbmPixmap(GbmSurfaceFactory* surface_manager,
             const scoped_refptr<GbmBuffer>& buffer);
 
   void SetProcessingCallback(
       const ProcessingCallback& processing_callback) override;
 
   // NativePixmap:
   void* GetEGLClientBuffer() const override;
   bool AreDmaBufFdsValid() const override;
@@ skipping 25 matching lines @@
   // this Pixmap. This holds the processed buffer.
   scoped_refptr<GbmPixmap> processed_pixmap_;
   ProcessingCallback processing_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(GbmPixmap);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_GPU_GBM_BUFFER_H_