Reviewed by Eric Seidel.

        [GTK] Clean up unecessary boilerplate from WebKitWebSettings and make private members meet WebKit style guidelines
        https://bugs.webkit.org/show_bug.cgi?id=61972

        Rename all private members of WebKitWebSettings to meet WebKit style guidelines and
        put the private struct definition in webkitwebsettingsprivate.h so it can be
        accessed from webkitwebview.cpp. This cuts down on the boilerplate immensely.

        * webkit/webkitwebsettings.cpp: Rename private members to meet WebKit style guidelines
        and allocate the private section with new/delete. This allows for using CString and removes
        the need for manual string memory management.
        * webkit/webkitwebsettingsprivate.h: Move the private struct definition here.
        * webkit/webkitwebview.cpp: Update to reflect new struct names. Remove boilerplate
        and other very small code cleanups.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@89282 268f45cc-cd09-0410-ab3c-d52691b4dbfc