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C++ source files generated by these templates were already converted to
snake_case.
This CL has no behavior changes.

Bug: 770603
Change-Id: Ief42bcec5ec354c9fa052e8559559e5aae199cfa
Reviewed-on: https://chromium-review.googlesource.com/965682Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543622}