public Builder clearThreatTypes() {
      threatTypes_ = java.util.Collections.emptyList();
      bitField0_ = (bitField0_ & ~0x00000002);
      onChanged();
      return this;
    }
<pre>
Required. The ThreatLists to search in.
</pre>

<code>
repeated .google.cloud.webrisk.v1beta1.ThreatType threat_types = 2 [(.google.api.field_behavior) = REQUIRED];
</code>

@return This builder for chaining.
java-webrisk/proto-google-cloud-webrisk-v1beta1/src/main/java/com/google/webrisk/v1beta1/SearchUrisRequest.java