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It blocks all third_party files except for third_party/WebKit.

NOPRESUBMIT=true

Bug: 836555
Change-Id: Id5695c88fa445bcf601d0f2e7a8040681f25c2fd
Reviewed-on: https://chromium-review.googlesource.com/1027011
Commit-Queue: Kent Tamura <tkent@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553409}