public Builder clearPageToken() {
      pageToken_ = getDefaultInstance().getPageToken();
      bitField0_ = (bitField0_ & ~0x00000004);
      onChanged();
      return this;
    }
<pre>
A page token, received from a previous
[ListCustomClasses][google.cloud.speech.v2.Speech.ListCustomClasses] call.
Provide this to retrieve the subsequent page.

When paginating, all other parameters provided to
[ListCustomClasses][google.cloud.speech.v2.Speech.ListCustomClasses] must
match the call that provided the page token.
</pre>

<code>string page_token = 3;</code>

@return This builder for chaining.
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/ListCustomClassesRequest.java