Enable cpplint and fix cpplint errors in webrtc/api

webrtc/api/jsepicecandidate.h

 /*
  *  Copyright 2012 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.
  */
 
 // Implements the IceCandidateInterface.
 
 #ifndef WEBRTC_API_JSEPICECANDIDATE_H_
 #define WEBRTC_API_JSEPICECANDIDATE_H_
 
 #include <string>
+#include <utility>
+#include <vector>
 
 #include "webrtc/api/jsep.h"
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/p2p/base/candidate.h"
 
 namespace webrtc {
 
 class JsepIceCandidate : public IceCandidateInterface {
  public:
   JsepIceCandidate(const std::string& sdp_mid, int sdp_mline_index);
@@ skipping 49 matching lines @@
 
  private:
   std::vector<JsepIceCandidate*> candidates_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(JsepCandidateCollection);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_JSEPICECANDIDATE_H_