Changes code using Compositor to pass in ContextFactory

ui/aura/window_tree_host_mac.h

Index: ui/aura/window_tree_host_mac.h
diff --git a/ui/aura/window_tree_host_mac.h b/ui/aura/window_tree_host_mac.h
index 8fbf4ec81bb3bcffa296b4290b249f5388d9a714..c704742ac3f9da0222deb7a8b033dc583338cacf 100644
--- a/ui/aura/window_tree_host_mac.h
+++ b/ui/aura/window_tree_host_mac.h
@@ -14,6 +14,7 @@
 #include "ui/gfx/rect.h"
 
 namespace ui {
+class ContextFactory;
 class MouseEvent;
 }
 
@@ -25,7 +26,8 @@ class TouchEventCalibrate;
 
 class AURA_EXPORT WindowTreeHostMac : public WindowTreeHost {
  public:
-  explicit WindowTreeHostMac(const gfx::Rect& bounds);
+  WindowTreeHostMac(const gfx::Rect& bounds,
+                    ui::ContextFactory* context_factory);
   virtual ~WindowTreeHostMac();
 
  private: