Enable cpplint for webrtc/modules/bitrate_controller and fix all uncovered cpplint errors.

webrtc/modules/bitrate_controller/bitrate_controller_impl.cc

 /*
  *  Copyright (c) 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.
  *
  */
 
 #include "webrtc/modules/bitrate_controller/bitrate_controller_impl.h"
 
 #include <algorithm>
+#include <map>
 #include <utility>
 
 #include "webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h"
 
 namespace webrtc {
 
 class BitrateControllerImpl::RtcpBandwidthObserverImpl
     : public RtcpBandwidthObserver {
  public:
   explicit RtcpBandwidthObserverImpl(BitrateControllerImpl* owner)
@@ skipping 201 matching lines @@
   bandwidth_estimation_.CurrentEstimate(&bitrate, &fraction_loss, &rtt);
   if (bitrate > 0) {
     bitrate = bitrate - std::min<int>(bitrate, reserved_bitrate_bps_);
     bitrate = std::max(bitrate, bandwidth_estimation_.GetMinBitrate());
     *bandwidth = bitrate;
     return true;
   }
   return false;
 }
 }  // namespace webrtc