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Add snake_case per-file lines as well as CamelCase per-file lines in OWNERS files in //third_party/WebKit

This is a preparation to rename all C++ files in //third_party/WebKit.
A follow-up CL will remove CamelCase per-file lines.

Bug: 768828
Change-Id: I398d3a8447f1f4fd025438310915b9f312b8c494
Reviewed-on: https://chromium-review.googlesource.com/991792
Commit-Queue: Kent Tamura <tkent@chromium.org>
Reviewed-by: Quinten Yearsley <qyearsley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547911}