Fix crash when updating ranking model in ChooserActivity.

Bug: 34095835

Test: manual tests (automated tests will be added later): 1. take a
picture and share it to Photos; 2. take a bug report and share it to
Gmail; 3. launch Chrome app, share a webpage to Drive; and 4. launch Contacts
and share a contact to Messenger.

Change-Id: Ie50c8305f90b6df69aa1e47c01d0b2212da0a37a