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

ppapi/c/ppb_graphics_2d.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.
  */
 
-/* From ppb_graphics_2d.idl modified Tue Jan 24 16:03:48 2012. */
+/* From ppb_graphics_2d.idl modified Mon Mar 19 11:35:04 2012. */
 
 #ifndef PPAPI_C_PPB_GRAPHICS_2D_H_
 #define PPAPI_C_PPB_GRAPHICS_2D_H_
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_macros.h"
 #include "ppapi/c/pp_point.h"
 #include "ppapi/c/pp_rect.h"
@@ 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.
-   *
-   * TODO(): Add back in the synchronous mode description once we have support
-   * for it.
-   */
   int32_t (*Flush)(PP_Resource graphics_2d,
                    struct PP_CompletionCallback callback);
 };
 
 typedef struct PPB_Graphics2D_1_0 PPB_Graphics2D;
 /**
  * @}
  */
 
 #endif  /* PPAPI_C_PPB_GRAPHICS_2D_H_ */