Mechanically apply TypedXml refaster template.

This is a purely mechanical CL that applies the output of the
recently added refaster templates to help guide towards more
efficient TypedXml methods.  There is no behavior change.

Bug: 171832118
Test: manual
Exempt-From-Owner-Approval: trivial refactoring
Change-Id: Ic95dd3de77c60482ad36b31706e6b701929f40b3