Change namespace from ui to gfx for NativePixmap related code

ui/ozone/platform/wayland/wayland_surface_factory.cc

 // Copyright 2016 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/ozone/platform/wayland/wayland_surface_factory.h"
 
 #include <fcntl.h>
 #include <sys/mman.h>
 #include <wayland-client.h>
 
@@ skipping 204 matching lines @@
   switch (implementation) {
     case gl::kGLImplementationEGLGLES2:
       return egl_implementation_.get();
     case gl::kGLImplementationOSMesaGL:
       return osmesa_implementation_.get();
     default:
       return nullptr;
   }
 }
 
-scoped_refptr<NativePixmap> WaylandSurfaceFactory::CreateNativePixmap(
+scoped_refptr<gfx::NativePixmap> WaylandSurfaceFactory::CreateNativePixmap(
     gfx::AcceleratedWidget widget,
     gfx::Size size,
     gfx::BufferFormat format,
     gfx::BufferUsage usage) {
   NOTIMPLEMENTED();
   return nullptr;
 }
 
-scoped_refptr<NativePixmap> WaylandSurfaceFactory::CreateNativePixmapFromHandle(
+scoped_refptr<gfx::NativePixmap>
+WaylandSurfaceFactory::CreateNativePixmapFromHandle(
     gfx::AcceleratedWidget widget,
     gfx::Size size,
     gfx::BufferFormat format,
     const gfx::NativePixmapHandle& handle) {
   NOTIMPLEMENTED();
   return nullptr;
 }
 
 }  // namespace ui