public Builder clearVersionToken() {
      bitField0_ = (bitField0_ & ~0x00000002);
      versionToken_ = getDefaultInstance().getVersionToken();
      onChanged();
      return this;
    }
<pre>
The current version token of the client for the requested list (the
client version that was received from the last successful diff).
</pre>

<code>bytes version_token = 2;</code>

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