Fix Chromium clang plugin warnings

webrtc/common_audio/blocker.cc

 /*
  *  Copyright (c) 2014 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.
  */
 
@@ skipping 107 matching lines @@
       window_(new float[block_size_]),
       shift_amount_(shift_amount),
       callback_(callback) {
   RTC_CHECK_LE(num_output_channels_, num_input_channels_);
   RTC_CHECK_LE(shift_amount_, block_size_);
 
   memcpy(window_.get(), window, block_size_ * sizeof(*window_.get()));
   input_buffer_.MoveReadPositionBackward(initial_delay_);
 }
 
+Blocker::~Blocker() = default;
+
 // When block_size < chunk_size the input and output buffers look like this:
 //
 //                      delay*             chunk_size    chunk_size + delay*
 //  buffer: <-------------|---------------------|---------------|>
 //                _a_              _b_                 _c_
 //
 // On each call to ProcessChunk():
 // 1. New input gets read into sections _b_ and _c_ of the input buffer.
 // 2. We block starting from frame_offset.
 // 3. We block until we reach a block |bl| that doesn't contain any frames
@@ skipping 89 matching lines @@
   ZeroOut(output_buffer_.channels(),
           initial_delay_,
           chunk_size_,
           num_output_channels_);
 
   // Calculate new starting frames.
   frame_offset_ = first_frame_in_block - chunk_size_;
 }
 
 }  // namespace webrtc