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

content/browser/renderer_host/touch_smooth_scroll_gesture_aura.cc

 // Copyright (c) 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 "content/browser/renderer_host/touch_smooth_scroll_gesture_aura.h"
 
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "ui/aura/root_window.h"
 #include "ui/events/event.h"
 #include "ui/events/event_utils.h"
 #include "ui/gfx/transform.h"
 
 namespace {
 
 void InjectTouchEvent(const gfx::Point& location,
                       ui::EventType type,
                       aura::Window* window) {
   gfx::Point screen_location = location;
+  aura::Window* root_window = window->GetRootWindow();
   // First convert the location from Window to RootWindow.
-  aura::RootWindow* root_window = window->GetRootWindow();
   aura::Window::ConvertPointToTarget(window, root_window, &screen_location);
   // Then convert the location from RootWindow to screen.
-  root_window->ConvertPointToHost(&screen_location);
+  aura::WindowEventDispatcher* dispatcher = root_window->GetDispatcher();
+  dispatcher->ConvertPointToHost(&screen_location);
   ui::TouchEvent touch(type, screen_location, 0, 0, ui::EventTimeForNow(),
                        1.0f, 1.0f, 1.0f, 1.0f);
-  aura::RootWindowHostDelegate* root_window_host_delegate =
-        root_window->AsRootWindowHostDelegate();
-  root_window_host_delegate->OnHostTouchEvent(&touch);
+  dispatcher->AsRootWindowHostDelegate()->OnHostTouchEvent(&touch);
 }
 
 }  // namespace
 
 namespace content {
 
 TouchSmoothScrollGestureAura::TouchSmoothScrollGestureAura(bool scroll_down,
                                                            int pixels_to_scroll,
                                                            int mouse_event_x,
                                                            int mouse_event_y,
@@ skipping 27 matching lines @@
   pixels_scrolled_ += abs(position_delta);
 
   if (pixels_scrolled_ >= pixels_to_scroll_) {
     InjectTouchEvent(location_, ui::ET_TOUCH_RELEASED, window_);
   }
 
   return true;
 }
 
 }  // namespace content