Makes RootWindowController window creation in terms of common types

ui/wm/core/visibility_controller.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_WM_CORE_VISIBILITY_CONTROLLER_H_
 #define UI_WM_CORE_VISIBILITY_CONTROLLER_H_
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/macros.h"
@@ skipping 55 matching lines @@
 };
 
 // Enable visibility change animation for specific |window|. Use this if
 // you want to enable visibility change animation on a specific window without
 // affecting other windows in the same container. Calling this on a window
 // whose animation is already enabled either by this function, or
 // via SetChildWindowVisibilityChangesAnimatedbelow below is allowed and
 // the animation stays enabled.
 void WM_EXPORT SetWindowVisibilityChangesAnimated(aura::Window* window);
 
-// Enable visibiilty change animation for all children of the |window|.
-// Tyically applied to a container whose child windows should be animated
+// Enable visibility change animation for all children of the |window|.
+// Typically applied to a container whose child windows should be animated
 // when their visibility changes.
 void WM_EXPORT SetChildWindowVisibilityChangesAnimated(
     aura::Window* window);
 
 }  // namespace wm
 
 #endif  // UI_WM_CORE_VISIBILITY_CONTROLLER_H_