am 1944e19c: am a3ab4364: am 67ebd315: am 399cf8d6: am 1fd235cb: am 70eec2ca: am 58eb8e98: am d20f0a42: Merge "Fix NPE when clearing an extension in nano protos"

* commit '1944e19cb1dc82a52d46a42fe8a0ed4037602565':