WebRtcVoiceEngineTest: Changed a static_cast to a checked_cast.

webrtc/modules/audio_coding/codecs/builtin_audio_decoder_factory_internal.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.
  */
 
@@ skipping 157 matching lines @@
        } else {
          return false;
        }
      }},
 #endif
 };
 
 class BuiltinAudioDecoderFactory : public AudioDecoderFactory {
  public:
   std::vector<AudioCodecSpec> GetSupportedDecoders() override {
-    // Although this looks a bit strange, it means specs need only be initalized
-    // once, and that that initialization is thread-safe.
+    // Although this looks a bit strange, it means specs need only be
+    // initialized once, and that that initialization is thread-safe.
     static std::vector<AudioCodecSpec> specs = [] {
       std::vector<AudioCodecSpec> specs;
 #ifdef WEBRTC_CODEC_OPUS
       // clang-format off
       AudioCodecSpec opus({"opus", 48000, 2, {
                              {"minptime", "10"},
                              {"useinbandfec", "1"}
                            }});
       // clang-format on
       opus.allow_comfort_noise = false;
@@ skipping 51 matching lines @@
 
 }  // namespace
 
 rtc::scoped_refptr<AudioDecoderFactory>
 CreateBuiltinAudioDecoderFactoryInternal() {
   return rtc::scoped_refptr<AudioDecoderFactory>(
       new rtc::RefCountedObject<BuiltinAudioDecoderFactory>);
 }
 
 }  // namespace webrtc