public Builder clearPageToken() {
      pageToken_ = getDefaultInstance().getPageToken();
      bitField0_ = (bitField0_ & ~0x00000002);
      onChanged();
      return this;
    }
<pre>
A token identifying a page of results to be returned. This should be a
`next_page_token` value returned from a previous List request.
If unspecified, the first page of results is returned.
</pre>

<code>string page_token = 2;</code>

@return This builder for chaining.
java-websecurityscanner/proto-google-cloud-websecurityscanner-v1alpha/src/main/java/com/google/cloud/websecurityscanner/v1alpha/ListScanRunsRequest.java