Make GetRootWindow() return a Window instead of a RootWindow.

ash/wm/toplevel_window_event_handler.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/wm/toplevel_window_event_handler.h"
 
 #include "ash/shell.h"
 #include "ash/wm/resize_shadow_controller.h"
 #include "ash/wm/window_resizer.h"
 #include "ash/wm/window_state.h"
@@ skipping 317 matching lines @@
   event->StopPropagation();
 }
 
 aura::client::WindowMoveResult ToplevelWindowEventHandler::RunMoveLoop(
     aura::Window* source,
     const gfx::Vector2d& drag_offset,
     aura::client::WindowMoveSource move_source) {
   DCHECK(!in_move_loop_);  // Can only handle one nested loop at a time.
   in_move_loop_ = true;
   move_cancelled_ = false;
-  aura::RootWindow* root_window = source->GetRootWindow();
+  aura::Window* root_window = source->GetRootWindow();
   DCHECK(root_window);
   gfx::Point drag_location;
   if (move_source == aura::client::WINDOW_MOVE_SOURCE_TOUCH &&
       aura::Env::GetInstance()->is_touch_down()) {
     in_gesture_drag_ = true;
     bool has_point = ui::GestureRecognizer::Get()->
         GetLastTouchPointForTarget(source, &drag_location);
     DCHECK(has_point);
   } else {
-    drag_location = root_window->GetLastMouseLocationInRoot();
+    drag_location = root_window->GetDispatcher()->GetLastMouseLocationInRoot();
     aura::Window::ConvertPointToTarget(
         root_window, source->parent(), &drag_location);
   }
   // Set the cursor before calling CreateScopedWindowResizer(), as that will
   // eventually call LockCursor() and prevent the cursor from changing.
   aura::client::CursorClient* cursor_client =
       aura::client::GetCursorClient(root_window);
   if (cursor_client)
     cursor_client->SetCursor(ui::kCursorPointer);
   CreateScopedWindowResizer(source, drag_location, HTCAPTION, move_source);
@@ skipping 170 matching lines @@
 void ToplevelWindowEventHandler::ResizerWindowDestroyed() {
   // We explicitly don't invoke RevertDrag() since that may do things to window.
   // Instead we destroy the resizer.
   window_resizer_.reset();
 
   // End the move loop. This does nothing if we're not in a move loop.
   EndMoveLoop();
 }
 
 }  // namespace ash