migrateInnerFrame_() {
    G_testRunner.log('Migrating inner frame');
    this.reinitializePromises_();
    const innerFrameProtoVersion =
        this.innerFrameCfg_[CfgFields.NATIVE_TRANSPORT_PROTOCOL_VERSION];
    this.innerFrameResponseReceived_.promise.then(
        this.checkChannelNames_, null, this);
    this.innerFrameCfg_[CfgFields.NATIVE_TRANSPORT_PROTOCOL_VERSION] =
        innerFrameProtoVersion == 1 ? 2 : 1;
    this.performInnerFrameReconnect_();
  }
Migrate the inner frame to the alternate protocol version and reconnect it.
@private