Revert 178251 - Suspected for CrOS ASAN break

> Situation: There are 5 ways of knowing that the window hierarchy changed.
> This is ridiculous!
> We need to develop one universal standard that covers everyone's use cases.
> Yeah!
> ...
> Situation: There are 6 ways of knowing that the window hierarchy changed.
> 
> (source: http://xkcd.com/927/)
> 
> Creates a single hierarchy change notification capable of expressing everything all our clients currently need and more (needed for FocusController).
> This adds the notification and the unit tests, I will work on replacing the existing users in a future CL.
> 
> BUG=none
> R=sky@chromium.org
> 
> Review URL: https://chromiumcodereview.appspot.com/12042034

TBR=ben@chromium.org
Review URL: https://codereview.chromium.org/12040038

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@178280 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 0 insertions, 23 deletions

diff --git a/ui/aura/window_observer.h b/ui/aura/window_observer.h
index e519d45..0514c2c 100644
--- a/ui/aura/window_observer.h
+++ b/ui/aura/window_observer.h
@@ -18,29 +18,6 @@ class Window;
 
 class AURA_EXPORT WindowObserver {
  public:
-  struct HierarchyChangeParams {
-    enum HierarchyChangePhase {
-      HIERARCHY_CHANGING,
-      HIERARCHY_CHANGED
-    };
-
-    Window* target;     // The window that was added or removed.
-    Window* new_parent;
-    Window* old_parent;
-    HierarchyChangePhase phase;
-    Window* receiver;   // The window receiving the notification.
-  };
-
-  // Called when a window is added or removed. Notifications are sent to the
-  // following hierarchies in this order:
-  // 1. |target|.
-  // 2. |target|'s child hierarchy.
-  // 3. |target|'s parent hierarchy in its |old_parent|.
-  // 4. |target|'s parent hierarchy in its |new_parent|.
-  // This sequence is performed before and after the change is committed, with
-  // differing values for |phase| in |params| (see above).
-  virtual void OnWindowHierarchyChange(const HierarchyChangeParams& params) {}
-
   // Invoked when |new_window| has been added as a child of this window.
   virtual void OnWindowAdded(Window* new_window) {}