public Builder clearTargetAudienceClientId() {
            targetAudienceClientId_ = getDefaultInstance().getTargetAudienceClientId();
            bitField0_ = (bitField0_ & ~0x00000001);
            onChanged();
            return this;
          }
<pre>
Required. Describes OAuth2 client id of resources protected by
Identity-Aware-Proxy (IAP).
</pre>

<code>string target_audience_client_id = 1 [(.google.api.field_behavior) = REQUIRED];
</code>

@return This builder for chaining.
java-websecurityscanner/proto-google-cloud-websecurityscanner-v1/src/main/java/com/google/cloud/websecurityscanner/v1/ScanConfig.java