Fix rewrite_chrome_style plugin, which had bitrotted.

R=dcheng@chromium.org

Bug: 
Change-Id: Ie0b989644ed4d6b386d344ba41dae8273a2da6f9
Reviewed-on: https://chromium-review.googlesource.com/592688
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#490594}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: f1e23f3b538a311117bf507a7a120d46913bcaae
1 file changed