Revert of Adds back some debugging code

ui/aura/window_observer.h

Index: ui/aura/window_observer.h
diff --git a/ui/aura/window_observer.h b/ui/aura/window_observer.h
index ef1259a234d5b99d8e1dd80e3ed51b85fd8c2ff4..926e5c4428a5b25a9ad09b0ae3f713a927b3cb25 100644
--- a/ui/aura/window_observer.h
+++ b/ui/aura/window_observer.h
@@ -30,8 +30,6 @@
     HierarchyChangePhase phase;
     Window* receiver;   // The window receiving the notification.
   };
-
-  WindowObserver();
 
   // Called when a window is added or removed. Notifications are sent to the
   // following hierarchies in this order:
@@ -113,22 +111,7 @@
                                               Window* new_root) {}
 
  protected:
-  virtual ~WindowObserver();
-
- private:
-  friend class Window;
-
-  // Called when this is added as an observer on |window|.
-  void OnObservingWindow(Window* window);
-
-  // Called when this is removed from the observers on |window|.
-  void OnUnobservingWindow(Window* window);
-
-  // Tracks the number of windows being observed to track down
-  // http://crbug.com/365364.
-  int observing_;
-
-  DISALLOW_COPY_AND_ASSIGN(WindowObserver);
+  virtual ~WindowObserver() {}
 };
 
 }  // namespace aura