Replace WmWindowObserver with aura::WindowObserver.

ash/common/wm/root_window_layout_manager.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 "ash/common/wm/root_window_layout_manager.h"
 
 #include "ash/common/wm_window.h"
-#include "ash/common/wm_window_tracker.h"
+#include "ui/aura/window.h"
+#include "ui/aura/window_tracker.h"
 
 namespace ash {
 namespace wm {
 
 ////////////////////////////////////////////////////////////////////////////////
 // RootWindowLayoutManager, public:
 
 RootWindowLayoutManager::RootWindowLayoutManager(WmWindow* owner)
     : owner_(owner) {}
 
 RootWindowLayoutManager::~RootWindowLayoutManager() {}
 
 ////////////////////////////////////////////////////////////////////////////////
 // RootWindowLayoutManager, aura::LayoutManager implementation:
 
 void RootWindowLayoutManager::OnWindowResized() {
   const gfx::Rect fullscreen_bounds = gfx::Rect(owner_->GetBounds().size());
 
   // Resize both our immediate children (the containers-of-containers animated
   // by PowerButtonController) and their children (the actual containers).
-  WmWindowTracker children_tracker(owner_->GetChildren());
+  aura::WindowTracker children_tracker(owner_->aura_window()->children());
   while (!children_tracker.windows().empty()) {
-    WmWindow* child = children_tracker.Pop();
+    aura::Window* child = children_tracker.Pop();
     // Skip descendants of top-level windows, i.e. only resize containers and
     // other windows without a delegate, such as ScreenDimmer windows.
     if (child->GetToplevelWindow())
       continue;
 
     child->SetBounds(fullscreen_bounds);
-    WmWindowTracker grandchildren_tracker(child->GetChildren());
+    aura::WindowTracker grandchildren_tracker(child->children());
     while (!grandchildren_tracker.windows().empty()) {
       child = grandchildren_tracker.Pop();
       if (!child->GetToplevelWindow())
         child->SetBounds(fullscreen_bounds);
     }
   }
 }
 
 void RootWindowLayoutManager::OnWindowAddedToLayout(WmWindow* child) {}
 
 void RootWindowLayoutManager::OnWillRemoveWindowFromLayout(WmWindow* child) {}
 
 void RootWindowLayoutManager::OnWindowRemovedFromLayout(WmWindow* child) {}
 
 void RootWindowLayoutManager::OnChildWindowVisibilityChanged(WmWindow* child,
                                                              bool visible) {}
 
 void RootWindowLayoutManager::SetChildBounds(
     WmWindow* child,
     const gfx::Rect& requested_bounds) {
   child->SetBoundsDirect(requested_bounds);
 }
 
 }  // namespace wm
 }  // namespace ash