Moved XMPP notifier library from chrome/browser/sync to chrome/common....

chrome/browser/sync/notifier/base/nethelpers.cc

-// Copyright (c) 2009 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 "build/build_config.h"
-#include "chrome/browser/sync/notifier/base/nethelpers.h"
-
-namespace notifier {
-
-hostent* SafeGetHostByName(const char* hostname, hostent* host,
-                           char* buffer, size_t buffer_len,
-                           int* herrno) {
-  hostent* result = NULL;
-#if WIN32
-  result = gethostbyname(hostname);
-  if (!result) {
-    *herrno = WSAGetLastError();
-  }
-#elif OS_LINUX
-  gethostbyname_r(hostname, host, buffer, buffer_len, &result, herrno);
-#elif OS_MACOSX
-  result = getipnodebyname(hostname, AF_INET, AI_DEFAULT, herrno);
-#else
-#error "I don't know how to do gethostbyname safely on your system."
-#endif
-  return result;
-}
-
-// This function should mirror the above function, and free any resources
-// allocated by the above.
-void FreeHostEnt(hostent* host) {
-#if WIN32
-  // No need to free anything, struct returned is static memory.
-#elif OS_LINUX
-  // No need to free anything, we pass in a pointer to a struct.
-#elif OS_MACOSX
-  freehostent(host);
-#else
-#error "I don't know how to free a hostent on your system."
-#endif
-}
-
-}  // namespace notifier