The change converts the following files to typescript:
* elements/shared/gr-labeled-autocomplete/gr-labeled-autocomplete.ts
* elements/shared/gr-repo-branch-picker/gr-repo-branch-picker.ts
* elements/change-list/gr-create-destination-dialog/gr-create-destination-dialog.ts
Change-Id: Ief6f2c55ffba7693b566f23cc46b59d7f2b5ebec