Don't hold onto SkBitmap in mus_demo.

services/ui/demo/mus_demo.h

Index: services/ui/demo/mus_demo.h
diff --git a/services/ui/demo/mus_demo.h b/services/ui/demo/mus_demo.h
index 4cc334272a1242fc5b011448c6f44a3554526dc1..f228bd31ee1e931211389a992839b1eb8b3f30ab 100644
--- a/services/ui/demo/mus_demo.h
+++ b/services/ui/demo/mus_demo.h
@@ -15,7 +15,6 @@
 #include "base/macros.h"
 #include "base/timer/timer.h"
 #include "services/service_manager/public/cpp/service.h"
-#include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/aura/mus/window_manager_delegate.h"
 #include "ui/aura/mus/window_tree_client_delegate.h"
 #include "ui/display/screen_base.h"
@@ -121,9 +120,6 @@ class MusDemo : public service_manager::Service,
   // Destroys itself when the window gets destroyed.
   aura_extra::ImageWindowDelegate* window_delegate_ = nullptr;
 
-  // Bitmap that is the same size as our client window area.
-  SkBitmap bitmap_;
-
   // Timer for calling DrawFrame().
   base::RepeatingTimer timer_;