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Most of these have been fixed automatically with ESLint's --fix flag.

This is in preparation of turning on presubmit checks for no-var and prefer-const
for components/.

Bug: 792774,720034
Change-Id: I482ed8577bf260a6190fb646891194f8d533debc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1914496
Auto-Submit: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715885}