Extract shell methods from ApplicationImpl into a base class, and pass this to Initialize() instead.

components/bitmap_uploader/bitmap_uploader.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 COMPONENTS_BITMAP_UPLOADER_BITMAP_UPLOADER_H_
 #define COMPONENTS_BITMAP_UPLOADER_BITMAP_UPLOADER_H_
 
 #include <stdint.h>
 
 #include "base/compiler_specific.h"
 #include "base/containers/hash_tables.h"
 #include "base/macros.h"
 #include "components/bitmap_uploader/bitmap_uploader_export.h"
 #include "components/mus/public/cpp/window_surface.h"
 #include "components/mus/public/interfaces/compositor_frame.mojom.h"
 #include "components/mus/public/interfaces/gpu.mojom.h"
 #include "gpu/GLES2/gl2chromium.h"
 #include "gpu/GLES2/gl2extchromium.h"
 #include "mojo/public/c/gles2/gles2.h"
 
 namespace mojo {
-namespace shell {
-namespace mojom {
 class Shell;
 }
-}
-}
 
 namespace bitmap_uploader {
 
 BITMAP_UPLOADER_EXPORT extern const char kBitmapUploaderForAcceleratedWidget[];
 
 // BitmapUploader is useful if you want to draw a bitmap or color in a
 // mus::Window.
 class BITMAP_UPLOADER_EXPORT BitmapUploader
     : NON_EXPORTED_BASE(public mus::mojom::SurfaceClient) {
  public:
   explicit BitmapUploader(mus::Window* window);
   ~BitmapUploader() override;
 
-  void Init(mojo::shell::mojom::Shell* shell);
+  void Init(mojo::Shell* shell);
 
   // Sets the color which is RGBA.
   void SetColor(uint32_t color);
 
   enum Format {
     RGBA,  // Pixel layout on Android.
     BGRA,  // Pixel layout everywhere else.
   };
 
   // Sets a bitmap.
@@ skipping 32 matching lines @@
   uint32_t id_namespace_;
   base::hash_map<uint32_t, uint32_t> resource_to_texture_id_map_;
   mojo::Binding<mus::mojom::SurfaceClient> surface_client_binding_;
 
   DISALLOW_COPY_AND_ASSIGN(BitmapUploader);
 };
 
 }  // namespace bitmap_uploader
 
 #endif  // COMPONENTS_BITMAP_UPLOADER_BITMAP_UPLAODER_H_