Remove deprecated methods from debugger API

Remove deprecated methods from debugger API

Deleting SetDebugEventListener and SetMessageHandler from v8::Debug. this methods were deprecated in 3.20
https://code.google.com/p/v8/source/browse/branches/3.20/include/v8-debug.h but in fact they have been superseded by SetDebugEventListener2 and SetMessageHandler2 long ago.

BUG=None
R=bmeurer@chromium.org, loislo@chromium.org

Review URL: https://codereview.chromium.org/23576002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16379 ce2b1a6d-e550-0410-aec6-3dcde31c8c00