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Fixes current lint warnings and starts to remove obsolete old
suppressions. Moving towards a world where we have as few suppressions
as possible.

Bug: 731159
Change-Id: If960d984b0906b80d3cd8c504a0d0af83f6a8a89
Reviewed-on: https://chromium-review.googlesource.com/578488Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Xi Han <hanxi@chromium.org>
Reviewed-by: Yuwei Huang <yuweih@chromium.org>
Commit-Queue: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488307}