Eliminates all ash dependencies from WindowModalityController.

ui/views/corewm/focus_controller.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/corewm/focus_controller.h"
 
 #include "base/auto_reset.h"
 #include "ui/aura/env.h"
 #include "ui/views/corewm/focus_change_event.h"
 #include "ui/views/corewm/focus_rules.h"
@@ skipping 73 matching lines @@
 }
 
 void FocusController::DeactivateWindow(aura::Window* window) {
   FocusWindow(rules_->GetNextActivatableWindow(window));
 }
 
 aura::Window* FocusController::GetActiveWindow() {
   return active_window_;
 }
 
+aura::Window* FocusController::GetActivatableWindow(aura::Window* window) {
+  return rules_->GetActivatableWindow(window);
+}
+
 bool FocusController::OnWillFocusWindow(aura::Window* window,
                                         const ui::Event* event) {
   NOTREACHED();
   return false;
 }
 
 bool FocusController::CanActivateWindow(aura::Window* window) const {
   return rules_->CanActivateWindow(window);
 }
 
@@ skipping 109 matching lines @@
     SetFocusedWindow(rules_->GetNextFocusableWindow(window));
   }
 }
 
 void FocusController::WindowFocusedFromInputEvent(aura::Window* window) {
   FocusWindow(window);
 }
 
 }  // namespace corewm
 }  // namespace views