make SetReceiveBufferSize and SetSendBufferSize return net error codes (instead of bools)

net/udp/udp_socket_libevent.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.
 
 #ifndef NET_UDP_UDP_SOCKET_LIBEVENT_H_
 #define NET_UDP_UDP_SOCKET_LIBEVENT_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 76 matching lines @@
   // |callback| is the user callback function to call on complete.
   // Returns a net error code, or ERR_IO_PENDING if the IO is in progress.
   // If ERR_IO_PENDING is returned, the caller must keep |buf| and |address|
   // alive until the callback is called.
   int SendTo(IOBuffer* buf,
              int buf_len,
              const IPEndPoint& address,
              const CompletionCallback& callback);
 
   // Set the receive buffer size (in bytes) for the socket.
-  bool SetReceiveBufferSize(int32 size);
+  int SetReceiveBufferSize(int32 size);
 
   // Set the send buffer size (in bytes) for the socket.
-  bool SetSendBufferSize(int32 size);
+  int SetSendBufferSize(int32 size);
 
   // Returns true if the socket is already connected or bound.
   bool is_connected() const { return socket_ != kInvalidSocket; }
 
   const BoundNetLog& NetLog() const { return net_log_; }
 
   // Sets corresponding flags in |socket_options_| to allow the socket
   // to share the local address to which the socket will be bound with
   // other processes. Should be called before Bind().
   void AllowAddressReuse();
@@ skipping 180 matching lines @@
   CompletionCallback write_callback_;
 
   BoundNetLog net_log_;
 
   DISALLOW_COPY_AND_ASSIGN(UDPSocketLibevent);
 };
 
 }  // namespace net
 
 #endif  // NET_UDP_UDP_SOCKET_LIBEVENT_H_