Use base::StringPiece for input parameters in Encryptor, rather than std::string

R=wtc
BUG=none
TEST=crypto_unittests


Review URL: http://codereview.chromium.org/7230037

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@91800 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed