Remove incorrect use of std:: in chromedriver_server.cc.

setlocale() isn't part of the std:: namespace. This was breaking libc++ builds.

BUG=318770
TBR=stgao@chromium.org
NOTRY=true
TEST=built with libc++ and libstdc++

Review URL: https://codereview.chromium.org/342433005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@277805 0039d316-1c4b-4281-b951-d872f2087c98