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Many of these lint warnings were turned off because it was difficult to
fix all of them when they were introduced (usually via a lint update)
and fix incoming new errors at the same time.

Adding existing issues to the baseline and enabling for new code.

Bug: 1116130,807734,671170,831774,635567
Bug: 1069186,804427
Fixed: 807734,635567,804427
Change-Id: Id955384003a6928ea5ad3efe635a84515663b17b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2369576
Commit-Queue: Peter Wen <wnwen@chromium.org>
Auto-Submit: Peter Wen <wnwen@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801073}