Fixing a comment on AEC divergence metric.

webrtc/modules/audio_processing/aec/aec_core.cc

Index: webrtc/modules/audio_processing/aec/aec_core.cc
diff --git a/webrtc/modules/audio_processing/aec/aec_core.cc b/webrtc/modules/audio_processing/aec/aec_core.cc
index fb1a7a506a89551461109ca435c500ea174226c1..08079b8a3f67ff7e7aed9f730de02b04b2cfd7e8 100644
--- a/webrtc/modules/audio_processing/aec/aec_core.cc
+++ b/webrtc/modules/audio_processing/aec/aec_core.cc
@@ -74,9 +74,9 @@ static const size_t kCountLen = 50;
 static const int kDelayMetricsAggregationWindow = 1250;  // 5 seconds at 16 kHz.
 
 // Divergence metric is based on audio level, which gets updated every
-// |kCountLen + 1| * 10 milliseconds. Divergence metric takes the statistics of
-// |kDivergentFilterFractionAggregationWindowSize| samples. Current value
-// corresponds to 1 second at 16 kHz.
+// |kSubCountLen + 1| * PART_LEN samples. Divergence metric takes the statistics
+// of |kDivergentFilterFractionAggregationWindowSize| audio levels. The
+// following value corresponds to 1 second at 16 kHz.
 static const int kDivergentFilterFractionAggregationWindowSize = 50;
 
 // Quantities to control H band scaling for SWB input