Move the concept of Activation to the Shell.

ui/aura/root_window.h

Index: ui/aura/root_window.h
===================================================================
--- ui/aura/root_window.h	(revision 113647)
+++ ui/aura/root_window.h	(working copy)
@@ -57,7 +57,6 @@
   gfx::Point last_mouse_location() const { return last_mouse_location_; }
   gfx::NativeCursor last_cursor() const { return last_cursor_; }
   StackingClient* stacking_client() { return stacking_client_.get(); }
-  Window* active_window() { return active_window_; }
   Window* mouse_pressed_handler() { return mouse_pressed_handler_; }
   Window* capture_window() { return capture_window_; }
   ScreenAura* screen() { return screen_; }
@@ -95,20 +94,6 @@
   // Called when the native screen's resolution changes.
   void OnNativeScreenResized(const gfx::Size& size);
 
-  // Sets the active window to |window| and the focused window to |to_focus|.
-  // If |to_focus| is NULL, |window| is focused. Does nothing if |window| is
-  // NULL.
-  void SetActiveWindow(Window* window, Window* to_focus);
-
-  // Activates the topmost window. Does nothing if the topmost window is already
-  // active.
-  void ActivateTopmostWindow();
-
-  // Deactivates |window| and activates the topmost window. Does nothing if
-  // |window| is not a topmost window, or there are no other suitable windows to
-  // activate.
-  void Deactivate(Window* window);
-
   // Invoked when |window| is initialized.
   void WindowInitialized(Window* window);
 
@@ -122,8 +107,8 @@
   MessageLoop::Dispatcher* GetDispatcher();
 
   // Add/remove observer.
-  void AddObserver(RootWindowObserver* observer);
-  void RemoveObserver(RootWindowObserver* observer);
+  void AddRootWindowObserver(RootWindowObserver* observer);
+  void RemoveRootWindowObserver(RootWindowObserver* observer);
 
   // Are any mouse buttons currently down?
   bool IsMouseButtonDown() const;
@@ -208,8 +193,6 @@
   // Used to schedule painting.
   base::WeakPtrFactory<RootWindow> schedule_paint_factory_;
 
-  Window* active_window_;
-
   // Last location seen in a mouse event.
   gfx::Point last_mouse_location_;
 
@@ -219,10 +202,6 @@
   // Last cursor set.  Used for testing.
   gfx::NativeCursor last_cursor_;
 
-  // Are we in the process of being destroyed? Used to avoid processing during
-  // destruction.
-  bool in_destructor_;
-
   ObserverList<RootWindowObserver> observers_;
 
   ScreenAura* screen_;