PPAPI Fullscreen: remove redundant code inherited from FlashFullscreen.

ppapi/api/dev/ppb_fullscreen_dev.idl

 /* Copyright (c) 2011 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.
  */
 
 
 /**
  * This file defines the <code>PPB_Fullscreen_Dev</code> interface.
  */
 
 label Chrome {
   M16 = 0.5
 };
 
 interface PPB_Fullscreen_Dev {
   /**
    * Checks whether the plugin instance is currently in fullscreen mode.
    */
   PP_Bool IsFullscreen(
       [in] PP_Instance instance);
 
   /**
    * Switches the plugin instance to/from fullscreen mode. Returns PP_TRUE on
    * success, PP_FALSE on failure.
    *
-   * This unbinds the current 2D or 3D devices. Pending flushes and swapbuffers
-   * will execute as if the resource was off-screen. The transition to and from
-   * fullscreen is asynchronous. During the transition, IsFullscreen will
-   * return the original value, and no 2D or 3D device can be bound.
-   * The transition ends at DidChangeView when IsFullscreen returns the new
-   * value. You might receive other DidChangeView calls while in
-   * transition.
+   * The transition to and from fullscreen is asynchronous.
+   * During the transition, IsFullscreen will return the original value, and
+   * no 2D or 3D device can be bound. The transition ends at DidChangeView
+   * when IsFullscreen returns the new value. You might receive other
+   * DidChangeView calls while in transition.
    *
    * The transition to fullscreen can only occur while the browser is
    * processing a user gesture, even if PP_TRUE is returned.
    */
   PP_Bool SetFullscreen(
       [in] PP_Instance instance,
       [in] PP_Bool fullscreen);
 
   /**
    * Gets the size of the screen in pixels. When going fullscreen, the instance
    * will be resized to that size.
    */
   PP_Bool GetScreenSize(
       [in] PP_Instance instance,
       [out] PP_Size size);
 };