Don't print errors to stderr in socket_*.

runtime/bin/socket_win.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
 #include "bin/builtin.h"
 #include "bin/eventhandler.h"
 #include "bin/file.h"
@@ skipping 88 matching lines @@
 
 
 intptr_t Socket::GetPort(intptr_t fd) {
   ASSERT(reinterpret_cast<Handle*>(fd)->is_socket());
   SocketHandle* socket_handle = reinterpret_cast<SocketHandle*>(fd);
   RawAddr raw;
   socklen_t size = sizeof(raw);
   if (getsockname(socket_handle->socket(),
                   &raw.addr,
                   &size) == SOCKET_ERROR) {
-    Log::PrintErr("Error getsockname: %d\n", WSAGetLastError());
     return 0;
   }
   return SocketAddress::GetAddrPort(&raw);
 }
 
 
 SocketAddress* Socket::GetRemotePeer(intptr_t fd, intptr_t* port) {
   ASSERT(reinterpret_cast<Handle*>(fd)->is_socket());
   SocketHandle* socket_handle = reinterpret_cast<SocketHandle*>(fd);
   RawAddr raw;
@@ skipping 430 matching lines @@
   ClientSocket* client_socket = reinterpret_cast<ClientSocket*>(fd);
   client_socket->Close();
 }
 
 
 static bool SetBlockingHelper(intptr_t fd, bool blocking) {
   SocketHandle* handle = reinterpret_cast<SocketHandle*>(fd);
   u_long iMode = blocking ? 0 : 1;
   int status = ioctlsocket(handle->socket(), FIONBIO, &iMode);
   if (status != NO_ERROR) {
-    Log::PrintErr("ioctlsocket FIONBIO failed: %d\n", status);
     return false;
   }
   return true;
 }
 
 
 bool Socket::SetNonBlocking(intptr_t fd) {
   return SetBlockingHelper(fd, false);
 }
 
@@ skipping 150 matching lines @@
                     proto,
                     MCAST_LEAVE_GROUP,
                     reinterpret_cast<char *>(&mreq),
                     sizeof(mreq)) == 0;
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_WINDOWS)