Get clang tidy builds green.

Some build targets have clang tidy enabled by default, even though
they're not in TreeHugger, grr.  To avoid this causing trouble in
the future, force-enable tidy for ourselves, and fix the handful of
issues that were causing the breakage.

Bug: 135341433
Test: manual
Change-Id: Ifc82bce04c70bcb8c27d47bc389e20607e9f7bbd
2 files changed