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

ui/aura/test/event_generator.h

 // 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.
 
 #ifndef UI_AURA_TEST_EVENT_GENERATOR_H_
 #define UI_AURA_TEST_EVENT_GENERATOR_H_
 
 #include <list>
 #include <vector>
 
@@ skipping 69 matching lines @@
 //
 // If one of these applies to your test, please use |ui_controls|
 // package instead.
 //
 // Note: The coordinates of the points in API is determined by the
 // EventGeneratorDelegate.
 class EventGenerator {
  public:
   // Creates an EventGenerator with the mouse/touch location (0,0),
   // which uses the |root_window|'s coordinates.
-  explicit EventGenerator(RootWindow* root_window);
+  explicit EventGenerator(Window* root_window);
 
   // Create an EventGenerator with EventGeneratorDelegate,
   // which uses the coordinates used by |delegate|.
   explicit EventGenerator(EventGeneratorDelegate* delegate);
 
   // Creates an EventGenerator with the mouse/touch location
   // at |initial_location|, which uses the |root_window|'s coordinates.
-  EventGenerator(RootWindow* root_window, const gfx::Point& initial_location);
+  EventGenerator(Window* root_window, const gfx::Point& initial_location);
 
   // Creates an EventGenerator with the mouse/touch location
   // centered over |window|, which uses the |root_window|'s coordinates.
-  EventGenerator(RootWindow* root_window, Window* window);
+  EventGenerator(Window* root_window, Window* window);
 
   virtual ~EventGenerator();
 
   // Explicitly sets the location used by mouse/touch events. This is set by the
   // various methods that take a location but can be manipulated directly,
   // typically for touch.
   void set_current_location(const gfx::Point& location) {
     current_location_ = location;
   }
   const gfx::Point& current_location() const { return current_location_; }
@@ skipping 201 matching lines @@
   // Set to true to cause events to be posted asynchronously.
   bool async_;
 
   DISALLOW_COPY_AND_ASSIGN(EventGenerator);
 };
 
 }  // namespace test
 }  // namespace aura
 
 #endif  // UI_AURA_TEST_EVENT_GENERATOR_H_