Makes GetRootWindow() public on Window so we can begin to convert uses of RootWindow::GetInstance().

ui/aura/window.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/aura/window.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/stl_util.h"
@@ skipping 126 matching lines @@
 void Window::SetTransparent(bool transparent) {
   // Cannot change transparent flag after the window is initialized.
   DCHECK(!layer());
   transparent_ = transparent;
 }
 
 ui::Layer* Window::AcquireLayer() {
   return layer_owner_.release();
 }
 
+RootWindow* Window::GetRootWindow() {
+  return const_cast<RootWindow*>(
+      static_cast<const Window*>(this)->GetRootWindow());
+}
+
+const RootWindow* Window::GetRootWindow() const {
+  return parent_ ? parent_->GetRootWindow() : NULL;
+}
+
 void Window::Show() {
   SetVisible(true);
 }
 
 void Window::Hide() {
   SetVisible(false);
   ReleaseCapture();
 }
 
 bool Window::IsVisible() const {
@@ skipping 346 matching lines @@
 
 bool Window::StopsEventPropagation() const {
   if (!stops_event_propagation_ || children_.empty())
     return false;
   aura::Window::Windows::const_iterator it =
       std::find_if(children_.begin(), children_.end(),
                    std::mem_fun(&aura::Window::IsVisible));
   return it != children_.end();
 }
 
-RootWindow* Window::GetRootWindow() {
-  return parent_ ? parent_->GetRootWindow() : NULL;
-}
-
 void Window::OnWindowDetachingFromRootWindow(aura::Window* window) {
 }
 
 void Window::OnWindowAttachedToRootWindow(aura::Window* window) {
 }
 
 void Window::SetBoundsInternal(const gfx::Rect& new_bounds) {
   gfx::Rect actual_new_bounds(new_bounds);
 
   // Ensure we don't go smaller than our minimum bounds.
@@ skipping 137 matching lines @@
                                         parent_->children().end(),
                                         this);
   for (++i; i != parent_->children().end(); ++i) {
     if ((*i)->StopsEventPropagation())
       return true;
   }
   return false;
 }
 
 }  // namespace aura