Fix "control reaches end of non-void function" compile warning

Bug: None
Change-Id: I39f6341e4deecb17ee137674f2548f2151ec6cfd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2154353Reviewed-by: John Rummell <jrummell@chromium.org>
Reviewed-by: Matthew Wolenetz <wolenetz@chromium.org>
Commit-Queue: Matthew Wolenetz <wolenetz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#761143}

media/base/decode_status.cc

@@ -19,6 +19,9 @@ const char* GetDecodeStatusString(DecodeStatus status) {
     case DecodeStatus::DECODE_ERROR:
       return "DecodeStatus::DECODE_ERROR";
   }
+
+  NOTREACHED();
+  return "";
 }
 
 std::ostream& operator<<(std::ostream& os, const DecodeStatus& status) {

media/base/supported_types.cc

@@ -44,6 +44,9 @@ bool IsSupportedHdrMetadata(const HdrMetadataType& hdr_metadata_type) {
     case HdrMetadataType::kSmpteSt2094_40:
       return false;
   }
+
+  NOTREACHED();
+  return false;
 }
 
 }  // namespace
@@ -199,6 +202,9 @@ bool IsAudioCodecProprietary(AudioCodec codec) {
     case kUnknownAudioCodec:
       return false;
   }
+
+  NOTREACHED();
+  return false;
 }
 
 bool IsDefaultSupportedAudioType(const AudioType& type) {
@@ -269,6 +275,9 @@ bool IsVideoCodecProprietary(VideoCodec codec) {
     case kCodecAV1:
       return false;
   }
+
+  NOTREACHED();
+  return false;
 }
 
 // TODO(chcunningham): Add platform specific logic for Android (move from

media/filters/decoder_stream.cc

@@ -91,6 +91,9 @@ const char* GetStatusString(
     case DecoderStream<StreamType>::DECODE_ERROR:
       return "decode_error";
   }
+
+  NOTREACHED();
+  return "";
 }
 
 template <DemuxerStream::Type StreamType>