Remove the hack in string_util for RLZ library.
Remove the hack in string_util for RLZ library.

The rlz library was updated to include the right header from these string functions.

BUG=None
TEST=trybots

Review URL: http://codereview.chromium.org/3506003

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@60636 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser