Reduce the amount of included header files. Vast change like in "Oh God! This...

net/base/client_socket.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 "net/base/client_socket.h"
+
+#include "base/logging.h"
+#include "net/base/net_errors.h"
+
+namespace net {
+
+#if defined(OS_LINUX)
+// Identical to posix system call getpeername().
+// Needed by ssl_client_socket_nss.
+int ClientSocket::GetPeerName(struct sockaddr *name, socklen_t *namelen) {
+  // Default implementation just permits some unit tests to link.
+  NOTREACHED();
+  return ERR_UNEXPECTED;
+}
+#endif
+
+}  // namespace net