Try to tolerate running on contexts with SIGPIPE enabled.

net/socket/socket_descriptor.cc

 // 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.
 
 #include "net/socket/socket_descriptor.h"
 
 #if defined(OS_POSIX)
 #include <sys/types.h>
 #include <sys/socket.h>
 #endif
 
 #if defined(OS_WIN)
 #include <ws2tcpip.h>
 #include "net/base/winsock_init.h"
 #endif
 
+#if defined(OS_MACOSX)
+#include <unistd.h>
+#endif
+
 namespace net {
 
 SocketDescriptor CreatePlatformSocket(int family, int type, int protocol) {
 #if defined(OS_WIN)
   EnsureWinsockInit();
   SocketDescriptor result = ::WSASocket(family, type, protocol, nullptr, 0,
                                         WSA_FLAG_OVERLAPPED);
   if (result != kInvalidSocket && family == AF_INET6) {
     DWORD value = 0;
     if (setsockopt(result, IPPROTO_IPV6, IPV6_V6ONLY,
                    reinterpret_cast<const char*>(&value), sizeof(value))) {
       closesocket(result);
       return kInvalidSocket;
     }
   }
   return result;
 #else  // OS_WIN
-  return ::socket(family, type, protocol);
+  SocketDescriptor result = ::socket(family, type, protocol);
+#if defined(OS_MACOSX)
+  // Disable SIGPIPE on this socket. Although Chromium globally disables
+  // SIGPIPE, the net stack may be used in other consumers which do not do
+  // this. SO_NOSIGPIPE is a Mac-only API. On Linux, it is a flag on send.
+  if (result != kInvalidSocket) {
+    int value = 1;
+    if (setsockopt(result, SOL_SOCKET, SO_NOSIGPIPE, &value, sizeof(value))) {
+      close(result);
+      return kInvalidSocket;
+    }
+  }
+#endif
+  return result;
 #endif  // OS_WIN
 
 }
 
 }  // namespace net