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We recently switched from building chromium_builder_tests to building
everything, this fixes almost all warnings in the ~1000 translation units
we weren't compiling before.

No behavior change.
BUG=82385
R=scottmg@chromium.org
TBR=cpu

Review URL: https://codereview.chromium.org/543923002

Cr-Commit-Position: refs/heads/master@{#293393}