Migrate away from deprecated Truth APIs.

This is a transitional step towards truth 1.0.1, where these APIs have
been completely removed.

Bug: 168765701
Test: m checkbuild
Exempt-From-Owner-Approval: Cherry-pick of no-op refactor into another branch
Merged-In: I26ab5ab82bb939bbd9553c05387ac8641eb468b4
Change-Id: I26ab5ab82bb939bbd9553c05387ac8641eb468b4
(cherry picked from commit 4697f76e)