public Builder clearTitle() {
        title_ = getDefaultInstance().getTitle();
        bitField0_ = (bitField0_ & ~0x00000002);
        onChanged();
        return this;
      }
<pre>
Title of the chunk.
</pre>

<code>optional string title = 2;</code>

@return This builder for chaining.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/GroundingChunk.java