public Builder clearThreatType() {
      bitField0_ = (bitField0_ & ~0x00000001);
      threatType_ = 0;
      onChanged();
      return this;
    }
<pre>
Required. The threat list to update. Only a single ThreatType should be
specified per request. If you want to handle multiple ThreatTypes, you must
make one request per ThreatType.
</pre>

<code>
.google.cloud.webrisk.v1.ThreatType threat_type = 1 [(.google.api.field_behavior) = REQUIRED];
</code>

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