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

net/socket/tcp_socket_libevent.h

 // Copyright 2013 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_SOCKET_TCP_SOCKET_LIBEVENT_H_
 #define NET_SOCKET_TCP_SOCKET_LIBEVENT_H_
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/compiler_specific.h"
@@ skipping 43 matching lines @@
 
   // Sets various socket options.
   // The commonly used options for server listening sockets:
   // - SetAddressReuse(true).
   int SetDefaultOptionsForServer();
   // The commonly used options for client sockets and accepted sockets:
   // - SetNoDelay(true);
   // - SetKeepAlive(true, 45).
   void SetDefaultOptionsForClient();
   int SetAddressReuse(bool allow);
-  bool SetReceiveBufferSize(int32 size);
-  bool SetSendBufferSize(int32 size);
+  int SetReceiveBufferSize(int32 size);
+  int SetSendBufferSize(int32 size);
   bool SetKeepAlive(bool enable, int delay);
   bool SetNoDelay(bool no_delay);
 
   void Close();
 
   bool UsingTCPFastOpen() const;
   bool IsValid() const { return socket_ != kInvalidSocket; }
 
   // Marks the start/end of a series of connect attempts for logging purpose.
   //
@@ skipping 150 matching lines @@
   bool logging_multiple_connect_attempts_;
 
   BoundNetLog net_log_;
 
   DISALLOW_COPY_AND_ASSIGN(TCPSocketLibevent);
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_TCP_SOCKET_LIBEVENT_H_