WebSocket Pepper API: the second Close() should not return error code.

ppapi/api/ppb_websocket.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.
  */
 
 /**
  * This file defines the <code>PPB_WebSocket</code> interface providing
  * bi-directional, full-duplex, communications over a single TCP socket.
  */
 label Chrome {
@@ skipping 251 matching lines @@
    * connection.
    *
    * @return An int32_t containing an error code from <code>pp_errors.h</code>.
    * Returns <code>PP_ERROR_BADARGUMENT</code> if <code>reason</code> contains
    * an invalid character as a UTF-8 string, or is longer than 123 bytes.
    * <code>PP_ERROR_BADARGUMENT</code> corresponds to a JavaScript SyntaxError
    * in the WebSocket API specification.
    * Returns <code>PP_ERROR_NOACCESS</code> if the code is not an integer
    * equal to 1000 or in the range 3000 to 4999. <code>PP_ERROR_NOACCESS</code>
    * corresponds to an InvalidAccessError in the WebSocket API specification.
-   * Returns <code>PP_ERROR_INPROGRESS</code> if this is not the first call to
-   * Close().
+   * Returns <code>PP_ERROR_INPROGRESS</code> if a previous call to Close() is
+   * not finished.
    */
   int32_t Close([in] PP_Resource web_socket,
                 [in] uint16_t code,
                 [in] PP_Var reason,
                 [in] PP_CompletionCallback callback);
 
   /**
    * ReceiveMessage() receives a message from the WebSocket server.
    * This interface only returns a single message. That is, this interface must
    * be called at least N times to receive N messages, no matter the size of
@@ skipping 142 matching lines @@
    * @param[in] web_socket A <code>PP_Resource</code> corresponding to a
    * WebSocket.
    *
    * @return Returns a <code>PP_VARTYPE_STRING</code> var. If called before the
    * connection is established, the var contains the empty string. Returns a
    * <code>PP_VARTYPE_UNDEFINED</code> if this function is called on an
    * invalid resource.
    */
   PP_Var GetURL([in] PP_Resource web_socket);
 };