Removed workaround for the WARN_UNUSED_RESULT issue.

webrtc/modules/audio_processing/aec3/echo_canceller3.cc

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 #include "webrtc/modules/audio_processing/aec3/echo_canceller3.h"
@@ skipping 177 matching lines @@
                         &input->split_bands_f(0)[0][0],
                         LowestBandRate(sample_rate_hz_), 1);
 
   CopyBufferIntoFrame(input, num_bands_, frame_length_,
                       &render_queue_input_frame_);
 
   if (render_highpass_filter_) {
     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;
 
 EchoCanceller3::EchoCanceller3(int sample_rate_hz, bool use_highpass_filter)
     : EchoCanceller3(sample_rate_hz,
                      use_highpass_filter,
                      std::unique_ptr<BlockProcessor>(
                          BlockProcessor::Create(sample_rate_hz))) {}
 EchoCanceller3::EchoCanceller3(int sample_rate_hz,
@@ skipping 141 matching lines @@
 
     BufferRemainingRenderFrameContent(&render_blocker_, block_processor_.get(),
                                       &block_);
 
     frame_to_buffer =
         render_transfer_queue_.Remove(&render_queue_output_frame_);
   }
 }
 
 }  // namespace webrtc