Fix error when accumulating floats in an int.

webrtc/modules/audio_processing/level_controller/level_controller.cc

Index: webrtc/modules/audio_processing/level_controller/level_controller.cc
diff --git a/webrtc/modules/audio_processing/level_controller/level_controller.cc b/webrtc/modules/audio_processing/level_controller/level_controller.cc
index bd8d439874899321035a00dfccc16614555a965e..7f86552dfa48681894e4580517b9b182567e51bb 100644
--- a/webrtc/modules/audio_processing/level_controller/level_controller.cc
+++ b/webrtc/modules/audio_processing/level_controller/level_controller.cc
@@ -35,7 +35,7 @@ void UpdateAndRemoveDcLevel(float forgetting_factor,
                             rtc::ArrayView<float> x) {
   RTC_DCHECK(!x.empty());
   float mean =
-      std::accumulate(x.begin(), x.end(), 0) / static_cast<float>(x.size());
+      std::accumulate(x.begin(), x.end(), 0.0) / static_cast<float>(x.size());

[the sun, 2016/08/24 19:41:32]

Nice catch! Make it a 0.0f so we're not using doubles too.

   *dc_level += forgetting_factor * (mean - *dc_level);
 
   for (float& v : x) {