blink: Enforce comment formatting.
All of blink's comments are now reflown [1], so we can stop telling clang-format
that it shouldn't touch comments. Delete third_party/WebKit/.clang-format, since
the top-level .clang-format file now works for blink.
Also reflow a few straggler comments that made it in in the last day.
1: core/layout isn't completely done yet, so suppress comment reflow enforcement
in core/layout until the last two patches there made it through the cq.
BUG=563793
NOTRY=true
Review-Url: https://codereview.chromium.org/2393803004
Cr-Commit-Position: refs/heads/master@{#423558}
12 files changed
