public Builder clearPageToken() {
      pageToken_ = getDefaultInstance().getPageToken();
      bitField0_ = (bitField0_ & ~0x00000008);
      onChanged();
      return this;
    }
<pre>
Token identifying the page of results to return. If provided, use the
value of the `next_page_token` field from a previous request.
</pre>

<code>string page_token = 4;</code>

@return This builder for chaining.
java-trace/proto-google-cloud-trace-v1/src/main/java/com/google/devtools/cloudtrace/v1/ListTracesRequest.java