Changes code using Compositor to pass in ContextFactory

ui/aura/window_tree_host_ozone.h

Index: ui/aura/window_tree_host_ozone.h
diff --git a/ui/aura/window_tree_host_ozone.h b/ui/aura/window_tree_host_ozone.h
index f7ea62279965d3fee7c3be88e9e08c1c4a3cc10e..a04a7ced55a393c24dda672caebfa57da6fcf9eb 100644
--- a/ui/aura/window_tree_host_ozone.h
+++ b/ui/aura/window_tree_host_ozone.h
@@ -14,13 +14,18 @@
 #include "ui/gfx/insets.h"
 #include "ui/gfx/rect.h"
 
+namespace ui {
+class ContextFactory;
+}
+
 namespace aura {
 
 class AURA_EXPORT WindowTreeHostOzone : public WindowTreeHost,
                                         public ui::EventSource,
                                         public ui::PlatformEventDispatcher {
  public:
-  explicit WindowTreeHostOzone(const gfx::Rect& bounds);
+  WindowTreeHostOzone(const gfx::Rect& bounds,
+                      ui::ContextFactory* context_factory);
   virtual ~WindowTreeHostOzone();
 
  private: