Changes code using Compositor to pass in ContextFactory

ui/aura/window_tree_host_win.h

Index: ui/aura/window_tree_host_win.h
diff --git a/ui/aura/window_tree_host_win.h b/ui/aura/window_tree_host_win.h
index 6464851092741d69ef6586420a19800a249b510b..b54ea392909cfa9094d3566fd6c6b8a5fa6dd2cb 100644
--- a/ui/aura/window_tree_host_win.h
+++ b/ui/aura/window_tree_host_win.h
@@ -11,13 +11,18 @@
 #include "ui/events/event_source.h"
 #include "ui/gfx/win/window_impl.h"
 
+namespace ui {
+class ContextFactory;
+}
+
 namespace aura {
 
 class AURA_EXPORT WindowTreeHostWin : public WindowTreeHost,
                                       public ui::EventSource,
                                       public gfx::WindowImpl {
  public:
-  explicit WindowTreeHostWin(const gfx::Rect& bounds);
+  WindowTreeHostWin(const gfx::Rect& bounds,
+                    ui::ContextFactory* context_factory);
   virtual ~WindowTreeHostWin();
   // WindowTreeHost:
   virtual ui::EventSource* GetEventSource() OVERRIDE;