PPAPI Fullscreen: remove redundant code inherited from FlashFullscreen.

ppapi/api/dev/ppb_fullscreen_dev.idl

Index: ppapi/api/dev/ppb_fullscreen_dev.idl
===================================================================
--- ppapi/api/dev/ppb_fullscreen_dev.idl	(revision 105485)
+++ ppapi/api/dev/ppb_fullscreen_dev.idl	(working copy)
@@ -23,13 +23,11 @@
    * 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.