Mark |Clock*| as |const Clock*| (for some CongestionController and BWE related modules)

webrtc/modules/bitrate_controller/bitrate_controller_impl.h

 /*
  *  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.
  *
  *  Usage: this class will register multiple RtcpBitrateObserver's one at each
@@ skipping 13 matching lines @@
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/base/criticalsection.h"
 #include "webrtc/modules/bitrate_controller/send_side_bandwidth_estimation.h"
 
 namespace webrtc {
 
 class BitrateControllerImpl : public BitrateController {
  public:
   // TODO(perkj): BitrateObserver has been deprecated and is not used in WebRTC.
   // |observer| is left for project that is not yet updated.
-  BitrateControllerImpl(Clock* clock,
+  BitrateControllerImpl(const Clock* clock,
                         BitrateObserver* observer,
                         RtcEventLog* event_log);
   virtual ~BitrateControllerImpl() {}
 
   bool AvailableBandwidth(uint32_t* bandwidth) const override;
 
   RtcpBandwidthObserver* CreateRtcpBandwidthObserver() override;
 
   // Deprecated
   void SetStartBitrate(int start_bitrate_bps) override;
@@ skipping 33 matching lines @@
                                     int64_t now_ms);
 
   // Deprecated
   void MaybeTriggerOnNetworkChanged();
 
   void OnNetworkChanged(uint32_t bitrate,
                         uint8_t fraction_loss,  // 0 - 255.
                         int64_t rtt) EXCLUSIVE_LOCKS_REQUIRED(critsect_);
 
   // Used by process thread.
-  Clock* const clock_;
+  const Clock* const clock_;
   BitrateObserver* const observer_;
   int64_t last_bitrate_update_ms_;
   RtcEventLog* const event_log_;
 
   rtc::CriticalSection critsect_;
   SendSideBandwidthEstimation bandwidth_estimation_ GUARDED_BY(critsect_);
   uint32_t reserved_bitrate_bps_ GUARDED_BY(critsect_);
 
   uint32_t last_bitrate_bps_ GUARDED_BY(critsect_);
   uint8_t last_fraction_loss_ GUARDED_BY(critsect_);
   int64_t last_rtt_ms_ GUARDED_BY(critsect_);
   uint32_t last_reserved_bitrate_bps_ GUARDED_BY(critsect_);
 
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(BitrateControllerImpl);
 };
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_BITRATE_CONTROLLER_BITRATE_CONTROLLER_IMPL_H_