Revert "Move ParseUnaryExpression into ParserBase and add tests."

This reverts revision 20077.

Reason: build fail on some compilers.

BUG=
TBR=marja@chromium.org,rossberg@chromium.org

Review URL: https://codereview.chromium.org/203413009

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20078 ce2b1a6d-e550-0410-aec6-3dcde31c8c00