Enable cpplint for webrtc/examples and fix all uncovered cpplint errors.

webrtc/examples/peerconnection/server/data_socket.h

 /*
  *  Copyright 2011 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#ifndef TALK_EXAMPLES_PEERCONNECTION_SERVER_DATA_SOCKET_H_
-#define TALK_EXAMPLES_PEERCONNECTION_SERVER_DATA_SOCKET_H_
+#ifndef WEBRTC_EXAMPLES_PEERCONNECTION_SERVER_DATA_SOCKET_H_
+#define WEBRTC_EXAMPLES_PEERCONNECTION_SERVER_DATA_SOCKET_H_
 #pragma once
 
 #ifdef WIN32
 #include <winsock2.h>
 typedef int socklen_t;
 typedef SOCKET NativeSocket;
 #else
 #include <netinet/in.h>
 #include <sys/select.h>
 #include <sys/socket.h>
@@ skipping 120 matching lines @@
 // The server socket.  Accepts connections and generates DataSocket instances
 // for each new connection.
 class ListeningSocket : public SocketBase {
  public:
   ListeningSocket() {}
 
   bool Listen(unsigned short port);
   DataSocket* Accept() const;
 };
 
-#endif  // TALK_EXAMPLES_PEERCONNECTION_SERVER_DATA_SOCKET_H_
+#endif  // WEBRTC_EXAMPLES_PEERCONNECTION_SERVER_DATA_SOCKET_H_