Remove chrome-internal://newtab support

As of Chrome 33, Chrome no longer supports chrome-internal:// which means
no more access to the original new tab page.

This commit causes the internal new tab to redirect to options page. Some
users on Chrome 32 may be affected, but this extension will not support
protocols across Chrome versions. Users may download New Tab Redirect 2.1.1
and load the extension locally if they'd like to maintain the option in Chrome 32.