PPAPI: Remove out-dated or unnecessary TODOs from public files.

ppapi/api/ppb_graphics_2d.idl

 /* 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.
  */
 
 /**
  * Defines the <code>PPB_Graphics2D</code> struct representing a 2D graphics
  * context within the browser.
  */
 
@@ skipping 221 matching lines @@
    * the image has been painted on the screen.
    *
    * @return Returns <code>PP_OK</code> on success or
    * <code>PP_ERROR_BADRESOURCE</code> if the graphics context is invalid,
    * <code>PP_ERROR_BADARGUMENT</code> if the callback is null and flush is
    * being called from the main thread of the module, or
    * <code>PP_ERROR_INPROGRESS</code> if a flush is already pending that has
    * not issued its callback yet.  In the failure case, nothing will be updated
    * and no callback will be scheduled.
    */
-
-  /* TODO(darin): We should ensure that the completion callback always runs, so
-   * that it is easier for consumers to manage memory referenced by a callback.

[dmichael (off chromium), 2012/03/19 17:41:52]

polina's work for "required" callbacks fixed this a while ago (though developers
can still use "optional" callbacks if they want; it's just not the default).

-   *
-   * TODO(): Add back in the synchronous mode description once we have support
-   * for it.

[dmichael (off chromium), 2012/03/19 17:41:52]

That's just part of planned work.

-   */
   int32_t Flush(
       [in] PP_Resource graphics_2d,
       [in] PP_CompletionCallback callback);
 };