Removed workaround for the WARN_UNUSED_RESULT issue.

webrtc/modules/audio_processing/aec3/echo_canceller3.cc

Index: webrtc/modules/audio_processing/aec3/echo_canceller3.cc
diff --git a/webrtc/modules/audio_processing/aec3/echo_canceller3.cc b/webrtc/modules/audio_processing/aec3/echo_canceller3.cc
index 7e872daaa84aea076d4b3b073c0af50984641e21..4cd9c39729c2b3d2ae65660fabc0be0f8eff4849 100644
--- a/webrtc/modules/audio_processing/aec3/echo_canceller3.cc
+++ b/webrtc/modules/audio_processing/aec3/echo_canceller3.cc
@@ -195,10 +195,7 @@ void EchoCanceller3::RenderWriter::Insert(AudioBuffer* input) {
     render_highpass_filter_->Process(render_queue_input_frame_[0]);
   }
 
-  // TODO(peah): Change this two-step static cast once the CL for handling the
-  // bug causing this to fail in cc has landed.
-  bool result = render_transfer_queue_->Insert(&render_queue_input_frame_);
-  static_cast<void>(result);
+  static_cast<void>(render_transfer_queue_->Insert(&render_queue_input_frame_));
 }
 
 int EchoCanceller3::instance_count_ = 0;