Move the concept of Activation to the Shell.

ui/aura/window.h

Index: ui/aura/window.h
===================================================================
--- ui/aura/window.h	(revision 113647)
+++ ui/aura/window.h	(working copy)
@@ -92,14 +92,6 @@
   // Returns the window's bounds in screen coordinates.
   gfx::Rect GetScreenBounds() const;
 
-  // Activates this window. Only top level windows can be activated. Requests
-  // to activate a non-top level window are ignored.
-  void Activate();
-
-  // Deactivates this window. Only top level windows can be
-  // deactivated. Requests to deactivate a non-top level window are ignored.
-  void Deactivate();
-
   // Returns true if this window is active.
   bool IsActive() const;
 
@@ -135,9 +127,6 @@
   // |other|.
   void StackChildAbove(Window* child, Window* other);
 
-  // Returns true if this window can be activated.
-  bool CanActivate() const;
-
   // Tree operations.
   // TODO(beng): Child windows are currently not owned by the hierarchy. We
   //             should change this.