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

net/udp/datagram_server_socket.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_DATAGRAM_SERVER_SOCKET_H_
 #define NET_UDP_DATAGRAM_SERVER_SOCKET_H_
 
 #include "net/base/completion_callback.h"
 #include "net/base/net_util.h"
 #include "net/udp/datagram_socket.h"
@@ skipping 38 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.
   virtual int SendTo(IOBuffer* buf,
                      int buf_len,
                      const IPEndPoint& address,
                      const CompletionCallback& callback) = 0;
 
   // Set the receive buffer size (in bytes) for the socket.
-  virtual bool SetReceiveBufferSize(int32 size) = 0;
+  // Returns a net error code.
+  virtual int SetReceiveBufferSize(int32 size) = 0;
 
   // Set the send buffer size (in bytes) for the socket.
-  virtual bool SetSendBufferSize(int32 size) = 0;
+  // Returns a net error code.
+  virtual int SetSendBufferSize(int32 size) = 0;
 
   // Allow the socket to share the local address to which the socket will
   // be bound with other processes. Should be called before Listen().
   virtual void AllowAddressReuse() = 0;
 
   // Allow sending and receiving packets to and from broadcast addresses.
   // Should be called before Listen().
   virtual void AllowBroadcast() = 0;
 
   // Join the multicast group with address |group_address|.
@@ skipping 31 matching lines @@
   // some platforms. Returns a network error code.
   virtual int SetDiffServCodePoint(DiffServCodePoint dscp) = 0;
 
   // Resets the thread to be used for thread-safety checks.
   virtual void DetachFromThread() = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_UDP_DATAGRAM_SERVER_SOCKET_H_