Removed some copy-n-paste from StackFrame::Foo API entries.

BUG=v8:3436
LOG=y
R=dcarney@chromium.org

Review URL: https://codereview.chromium.org/388183002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22390 ce2b1a6d-e550-0410-aec6-3dcde31c8c00