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

webrtc/common_types.h

Index: webrtc/common_types.h
diff --git a/webrtc/common_types.h b/webrtc/common_types.h
index 1156bbcd77b8a7a34cc5203cdcfe439b6a5dd92d..e793be6a8014ad6dc5e023349591c3f1cbcb029c 100644
--- a/webrtc/common_types.h
+++ b/webrtc/common_types.h
@@ -759,12 +759,12 @@ struct OverUseDetectorOptions {
         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;