Follow-up to r19112.

There's only one error message for "eval" and "arguments", so no need to pass it
to PreParser::StrictModeIdentifierViolation.

BUG=3126
LOG=N
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/139713005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19137 ce2b1a6d-e550-0410-aec6-3dcde31c8c00