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offset-rotate now has a distinct use counter from offset-rotation.

update_use_counter_css.py has been updated to take into account the
effects of git cl format on UseCounter.cpp, where the case
and return statements are now on separate lines.

BUG=672264

Review-Url: https://codereview.chromium.org/2554263002
Cr-Commit-Position: refs/heads/master@{#437228}