Use safer IPC serializations in media_param_traits.cc

media/audio/android/audio_android_unittest.cc

Index: media/audio/android/audio_android_unittest.cc
diff --git a/media/audio/android/audio_android_unittest.cc b/media/audio/android/audio_android_unittest.cc
index b8ebccf3b2b5a4e1c0694d6bafd265ecef4b3c0c..64b3b4ba61361c3e58f6aa257b82aa5382a67356 100644
--- a/media/audio/android/audio_android_unittest.cc
+++ b/media/audio/android/audio_android_unittest.cc
@@ -60,8 +60,6 @@ static std::string FormatToString(AudioParameters::Format format) {
       return std::string("AUDIO_PCM_LOW_LATENCY");
     case AudioParameters::AUDIO_FAKE:
       return std::string("AUDIO_FAKE");
-    case AudioParameters::AUDIO_LAST_FORMAT:
-      return std::string("AUDIO_LAST_FORMAT");
     default:
       return std::string();
   }