Apply another regex upstream patch

http://bugs.icu-project.org/trac/ticket/11371


BUG=432209
TEST=See bug (comment 0 and comment 10)
R=markbrand@google.com

Review URL: https://codereview.chromium.org/734213003

git-svn-id: https://src.chromium.org/chrome/trunk/deps/third_party/icu52@292996 4ff67af0-8c30-449e-8e8b-ad334ec8d88c