[minijail] Update to new libchrome API

CommandLine::GetLooseValues() is deprecated, in favor of
CommandLine::args(), which returns a vector of strings.

BUG=None
TEST=Compile

Change-Id: Ia34ba23f275065b3ff267e89ff5a70cfdf6bef84

Review URL: http://codereview.chromium.org/3173010
2 files changed