ICU: Merge upstream r30255 to fix a clang warning.

BUG=chromium:114969
Review URL: https://chromiumcodereview.appspot.com/9425042

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/icu46@122842 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
3 files changed