Revert the process noise co-variance of the bitrate over-use estimator to its value prior to r9545.

webrtc/common_types.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.
  */
 
@@ skipping 741 matching lines @@
 // experimentation with bandwidth estimation parameters.
 // See modules/remote_bitrate_estimator/overuse_detector.h
 struct OverUseDetectorOptions {
   OverUseDetectorOptions()
       : initial_slope(8.0/512.0),
         initial_offset(0),
         initial_e(),
         initial_process_noise(),
         initial_avg_noise(0.0),
         initial_var_noise(50),
-        initial_threshold(25.0) {
+        initial_threshold(12.5) {

[pbos-webrtc, 2015/07/10 09:20:23]

Remove if unused like you say it is.

     initial_e[0][0] = 100;
     initial_e[1][1] = 1e-1;
     initial_e[0][1] = initial_e[1][0] = 0;
     initial_process_noise[0] = 1e-13;
-    initial_process_noise[1] = 1e-3;
+    initial_process_noise[1] = 1e-2;
   }
   double initial_slope;
   double initial_offset;
   double initial_e[2][2];
   double initial_process_noise[2];
   double initial_avg_noise;
   double initial_var_noise;
   double initial_threshold;
 };
 
@@ skipping 121 matching lines @@
 class StreamDataCountersCallback {
  public:
   virtual ~StreamDataCountersCallback() {}
 
   virtual void DataCountersUpdated(const StreamDataCounters& counters,
                                    uint32_t ssrc) = 0;
 };
 }  // namespace webrtc
 
 #endif  // WEBRTC_COMMON_TYPES_H_