Changes code using Compositor to pass in ContextFactory

ui/aura/window_tree_host_x11.h

Index: ui/aura/window_tree_host_x11.h
diff --git a/ui/aura/window_tree_host_x11.h b/ui/aura/window_tree_host_x11.h
index 1db9f675684d320b2f64aad9f6d42e7b4ea85fc7..8c51afb570f12148e1e1f7623a45dfb8b78f46b5 100644
--- a/ui/aura/window_tree_host_x11.h
+++ b/ui/aura/window_tree_host_x11.h
@@ -20,6 +20,7 @@ typedef unsigned long XID;
 typedef XID Window;
 
 namespace ui {
+class ContextFactory;
 class MouseEvent;
 }
 
@@ -34,7 +35,8 @@ class AURA_EXPORT WindowTreeHostX11 : public WindowTreeHost,
                                       public ui::PlatformEventDispatcher {
 
  public:
-  explicit WindowTreeHostX11(const gfx::Rect& bounds);
+  WindowTreeHostX11(const gfx::Rect& bounds,
+                    ui::ContextFactory* context_factory);
   virtual ~WindowTreeHostX11();
 
   // ui::PlatformEventDispatcher: