This should be behavior-preserving, so if `git blame` claims that this
CL touched something last, look at the previous CL touching the line
you're looking at.

  find third_party/WebKit/ -name '*.cpp' -o -name '*.h' -o -name '*.mm' | \
      xargs buildtools/linux64/clang-format -i

BUG=563793

Cr-Commit-Position: refs/heads/master@{#422256}