public Builder clearProjectId() {
        projectId_ = getDefaultInstance().getProjectId();
        bitField0_ = (bitField0_ & ~0x00000002);
        onChanged();
        return this;
      }
<pre>
Project in which the subnet exists.
If not set, this project is assumed to be the project for which
the connector create request was issued.
</pre>

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

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