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

ash/wm/window_positioner.cc

 // Copyright 2013 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/window_positioner.h"
 
 #include "ash/ash_switches.h"
 #include "ash/screen_ash.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
@@ skipping 120 matching lines @@
     bounds.set_x(work_area.x() + (work_area.width() - bounds.width()) / 2);
   }
 
   if (animated)
     SetBoundsAnimated(window, bounds);
   else
     window->SetBounds(bounds);
 }
 
 // Get the first open (non minimized) window which is on the screen defined.
-aura::Window* GetReferenceWindow(const aura::RootWindow* root_window,
+aura::Window* GetReferenceWindow(const aura::Window* root_window,
                                  const aura::Window* exclude,
                                  bool *single_window) {
   if (single_window)
     *single_window = true;
   // Get the active window.
   aura::Window* active = ash::wm::GetActiveWindow();
   if (active && active->GetRootWindow() != root_window)
     active = NULL;
 
   // Get a list of all windows.
@@ skipping 53 matching lines @@
 // static
 void WindowPositioner::GetBoundsAndShowStateForNewWindow(
     const gfx::Screen* screen,
     const aura::Window* new_window,
     bool is_saved_bounds,
     ui::WindowShowState show_state_in,
     gfx::Rect* bounds_in_out,
     ui::WindowShowState* show_state_out) {
 
   // Always open new window in the target display.
-  aura::RootWindow* target = Shell::GetTargetRootWindow();
+  aura::Window* target = Shell::GetTargetRootWindow();
 
   aura::Window* top_window = GetReferenceWindow(target, NULL, NULL);
   // Our window should not have any impact if we are already on top.
   if (top_window == new_window)
     top_window = NULL;
 
   // If there is no valid other window we take the coordinates as is.
   if (!top_window) {
     gfx::Rect work_area = screen->GetDisplayNearestWindow(target).work_area();
 
@@ skipping 280 matching lines @@
   // If the alignment was pushing the window out of the screen, we ignore the
   // alignment for that call.
   if (abs(pos.right() - work_area.right()) < grid)
     x = work_area.right() - w;
   if (abs(pos.bottom() - work_area.bottom()) < grid)
     y = work_area.bottom() - h;
   return gfx::Rect(x, y, w, h);
 }
 
 }  // namespace ash