Revert "Use icu::BreakIterator instead of the ubrk_* api. It makes the code cleaner."

This reverts r159441. It broke the android_aosp build and is blocking
the Blink roll.

http://build.chromium.org/p/tryserver.chromium/builders/android_aosp/builds/19078/steps/compile/logs/stdio

TBR=igor.o@sisa.samsung.com

Review URL: https://codereview.chromium.org/27052002

git-svn-id: svn://svn.chromium.org/blink/trunk@159462 bbb929c8-8fbe-4397-9dbb-9b2b20218538