views/mus: Create the BitmapUploader only when needed.

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 bd6b577e71401d1b123ef5aa4ff7ef60a0d4eb75..683e65faa1e74e6280595c079a6a1bf7ccd4ed08 100644
--- a/ui/views/mus/window_tree_host_mus.h
+++ b/ui/views/mus/window_tree_host_mus.h
@@ -11,10 +11,6 @@
 
 class SkBitmap;
 
-namespace bitmap_uploader {
-class BitmapUploader;
-}
-
 namespace mus {
 class Window;
 }
@@ -23,10 +19,6 @@ namespace shell {
 class Connector;
 }
 
-namespace ui {
-class ViewProp;
-}
-
 namespace views {
 
 class InputMethodMUS;
@@ -35,9 +27,7 @@ class PlatformWindowMus;
 
 class VIEWS_MUS_EXPORT WindowTreeHostMus : public aura::WindowTreeHostPlatform {
  public:
-  WindowTreeHostMus(shell::Connector* connector,
-                    NativeWidgetMus* native_widget,
-                    mus::Window* window);
+  WindowTreeHostMus(NativeWidgetMus* native_widget, mus::Window* window);
   ~WindowTreeHostMus() override;
 
  private:
@@ -50,10 +40,6 @@ class VIEWS_MUS_EXPORT WindowTreeHostMus : public aura::WindowTreeHostPlatform {
   NativeWidgetMus* native_widget_;
   std::unique_ptr<InputMethodMUS> input_method_;
 
-  // Bitmap management.
-  std::unique_ptr<bitmap_uploader::BitmapUploader> bitmap_uploader_;
-  std::unique_ptr<ui::ViewProp> prop_;
-
   DISALLOW_COPY_AND_ASSIGN(WindowTreeHostMus);
 };