Remove typedefs.h from webrtc/ root (part 1)

webrtc/modules/audio_device/ios/voice_processing_audio_unit.mm

Index: webrtc/modules/audio_device/ios/voice_processing_audio_unit.mm
diff --git a/webrtc/modules/audio_device/ios/voice_processing_audio_unit.mm b/webrtc/modules/audio_device/ios/voice_processing_audio_unit.mm
index 3701f3fee367d383be690fdad1c6effad6a20b0c..591a176d8f5ea75d2b5a967962c09c8e065c09f7 100644
--- a/webrtc/modules/audio_device/ios/voice_processing_audio_unit.mm
+++ b/webrtc/modules/audio_device/ios/voice_processing_audio_unit.mm
@@ -434,12 +434,12 @@ void VoiceProcessingAudioUnit::DisposeAudioUnit() {
       case kStarted:
         Stop();
         // Fall through.
-        FALLTHROUGH();
+        RTC_FALLTHROUGH();
       case kInitialized:
         Uninitialize();
         break;
       case kUninitialized:
-        FALLTHROUGH();
+        RTC_FALLTHROUGH();
       case kInitRequired:
         break;
     }