Add "PRIVATE" to the enum names of some private Pepper networking APIs:

ppapi/api/private/ppb_tcp_socket_private.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_TCPSocket_Private</code> interface.
  */
 
 label Chrome {
   M17 = 0.3,
   M20 = 0.4,
   M27 = 0.5
 };
 
 [assert_size(4)]
 enum PP_TCPSocketOption_Private {
   // Special value used for testing. Guaranteed to fail SetOption().
-  PP_TCPSOCKETOPTION_INVALID = 0,
+  PP_TCPSOCKETOPTION_PRIVATE_INVALID = 0,
 
   // Disable coalescing of small writes to make TCP segments, and instead
   // deliver data immediately. For SSL sockets, this option must be set before
   // SSLHandshake() is called. Value type is PP_VARTYPE_BOOL.
-  PP_TCPSOCKETOPTION_NO_DELAY = 1
+  PP_TCPSOCKETOPTION_PRIVATE_NO_DELAY = 1
 };
 
 /**
  * The <code>PPB_TCPSocket_Private</code> interface provides TCP socket
  * operations.
  */
 interface PPB_TCPSocket_Private {
   /**
    * Allocates a TCP socket resource.
    */
@@ skipping 118 matching lines @@
    * invoked with PP_OK if setting the option succeeds, or an error code
    * otherwise. The socket must be connection before SetOption is called.
    */
   [version=0.5]
   int32_t SetOption([in] PP_Resource tcp_socket,
                     [in] PP_TCPSocketOption_Private name,
                     [in] PP_Var value,
                     [in] PP_CompletionCallback callback);
 
 };