public Builder clearOriginalMimeType() {
      originalMimeType_ = getDefaultInstance().getOriginalMimeType();
      bitField0_ = (bitField0_ & ~0x00000040);
      onChanged();
      return this;
    }
<pre>
Mime type of the original audio file.  For example `audio/m4a`,
`audio/x-alaw-basic`, `audio/mp3`, `audio/3gpp`.
A list of possible audio mime types is maintained at
http://www.iana.org/assignments/media-types/media-types.xhtml#audio
</pre>

<code>string original_mime_type = 8;</code>

@return This builder for chaining.
java-speech/proto-google-cloud-speech-v1/src/main/java/com/google/cloud/speech/v1/RecognitionMetadata.java