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CL produced with ESLint --fix and clang-format.

This is in preparation for turning on the 'prefer-const' ESLint rule for that
folder.

Bug: 720034
Change-Id: If8287f806766c6addfe8ca32753f50ba3a5d29fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1884764
Auto-Submit: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Commit-Queue: Dan Beam <dbeam@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710186}