Remove OverUseDetectorOptions from OveruseDetector since it isn't used.

BUG=None

Review-Url: https://codereview.webrtc.org/2580733004
Cr-Commit-Position: refs/heads/master@{#15809}
diff --git a/webrtc/common_types.h b/webrtc/common_types.h
index fd5d820..0a1c67c 100644
--- a/webrtc/common_types.h
+++ b/webrtc/common_types.h
@@ -708,6 +708,9 @@
 // Bandwidth over-use detector options.  These are used to drive
 // experimentation with bandwidth estimation parameters.
 // See modules/remote_bitrate_estimator/overuse_detector.h
+// TODO(terelius): This is only used in overuse_estimator.cc, and only in the
+// default constructed state. Can we move the relevant variables into that
+// class and delete this? See also disabled warning at line 27
 struct OverUseDetectorOptions {
   OverUseDetectorOptions()
       : initial_slope(8.0 / 512.0),