Convert scanner buffers to use standard character types.

R=marja@chromium.org

BUG=

Review URL: https://codereview.chromium.org/198583003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19883 ce2b1a6d-e550-0410-aec6-3dcde31c8c00