public Builder clearAssetSource() {
      bitField0_ = (bitField0_ & ~0x00000002);
      assetSource_ = null;
      if (assetSourceBuilder_ != null) {
        assetSourceBuilder_.dispose();
        assetSourceBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
The source of the asset.
</pre>

<code>.google.cloud.visionai.v1.AssetSource asset_source = 2;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/UploadAssetRequest.java