WebRtcVoiceEngineTest: Changed a static_cast to a checked_cast.

webrtc/modules/audio_coding/codecs/builtin_audio_decoder_factory_internal.cc

Index: webrtc/modules/audio_coding/codecs/builtin_audio_decoder_factory_internal.cc
diff --git a/webrtc/modules/audio_coding/codecs/builtin_audio_decoder_factory_internal.cc b/webrtc/modules/audio_coding/codecs/builtin_audio_decoder_factory_internal.cc
index fd9f066cb440bade9700e8d627160aacb8f5dbae..8ec08e4251b5b10943302666d828463b655550e9 100644
--- a/webrtc/modules/audio_coding/codecs/builtin_audio_decoder_factory_internal.cc
+++ b/webrtc/modules/audio_coding/codecs/builtin_audio_decoder_factory_internal.cc
@@ -175,8 +175,8 @@ NamedDecoderConstructor decoder_constructors[] = {
 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