views/mus: Make PlatformWindowMus be responsible for setting-up the BitmapUploader.

ui/views/mus/window_tree_host_mus.h

Index: ui/views/mus/window_tree_host_mus.h
diff --git a/ui/views/mus/window_tree_host_mus.h b/ui/views/mus/window_tree_host_mus.h
index 0116e60b942666a71b0c941cb8ab8e25423755a0..f2a58b658e71ab3fa9699adff305fd16d7423301 100644
--- a/ui/views/mus/window_tree_host_mus.h
+++ b/ui/views/mus/window_tree_host_mus.h
@@ -12,10 +12,6 @@
 
 class SkBitmap;
 
-namespace bitmap_uploader {
-class BitmapUploader;
-}
-
 namespace mojo {
 class Shell;
 }
@@ -24,11 +20,6 @@ namespace mus {
 class Window;
 }
 
-namespace ui {
-class Compositor;
-class ViewProp;
-}
-
 namespace views {
 
 class InputMethodMUS;
@@ -44,9 +35,6 @@ class VIEWS_MUS_EXPORT WindowTreeHostMus : public aura::WindowTreeHostPlatform {
   ~WindowTreeHostMus() override;
 
   PlatformWindowMus* platform_window();
-  bitmap_uploader::BitmapUploader* bitmap_uploader() {
-    return bitmap_uploader_.get();
-  }
   ui::PlatformWindowState show_state() const { return show_state_; }
 
  private:
@@ -60,8 +48,6 @@ class VIEWS_MUS_EXPORT WindowTreeHostMus : public aura::WindowTreeHostPlatform {
   NativeWidgetMus* native_widget_;
   scoped_ptr<InputMethodMUS> input_method_;
   ui::PlatformWindowState show_state_;
-  scoped_ptr<bitmap_uploader::BitmapUploader> bitmap_uploader_;
-  scoped_ptr<ui::ViewProp> prop_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowTreeHostMus);
 };