Change namespace from ui to gfx for NativePixmap related code

ui/ozone/platform/headless/headless_surface_factory.cc

 // 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.
 
 #include "ui/ozone/platform/headless/headless_surface_factory.h"
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/location.h"
 #include "base/macros.h"
@@ skipping 53 matching lines @@
   }
   std::unique_ptr<gfx::VSyncProvider> CreateVSyncProvider() override {
     return nullptr;
   }
 
  private:
   base::FilePath location_;
   sk_sp<SkSurface> surface_;
 };
 
-class TestPixmap : public ui::NativePixmap {
+class TestPixmap : public gfx::NativePixmap {
  public:
   explicit TestPixmap(gfx::BufferFormat format) : format_(format) {}
 
   void* GetEGLClientBuffer() const override { return nullptr; }
   bool AreDmaBufFdsValid() const override { return false; }
   size_t GetDmaBufFdCount() const override { return 0; }
   int GetDmaBufFd(size_t plane) const override { return -1; }
   int GetDmaBufPitch(size_t plane) const override { return 0; }
   int GetDmaBufOffset(size_t plane) const override { return 0; }
   uint64_t GetDmaBufModifier(size_t plane) const override { return 0; }
@@ skipping 46 matching lines @@
       return nullptr;
   }
 }
 
 std::unique_ptr<SurfaceOzoneCanvas>
 HeadlessSurfaceFactory::CreateCanvasForWidget(gfx::AcceleratedWidget widget) {
   HeadlessWindow* window = window_manager_->GetWindow(widget);
   return base::WrapUnique<SurfaceOzoneCanvas>(new FileSurface(window->path()));
 }
 
-scoped_refptr<NativePixmap> HeadlessSurfaceFactory::CreateNativePixmap(
+scoped_refptr<gfx::NativePixmap> HeadlessSurfaceFactory::CreateNativePixmap(
     gfx::AcceleratedWidget widget,
     gfx::Size size,
     gfx::BufferFormat format,
     gfx::BufferUsage usage) {
   return new TestPixmap(format);
 }
 
 }  // namespace ui