Simplify the macro for this deprecation. g_type_init was deprecated in glib version 2.36.  The previous macros were not working for my clang linux build on ubuntu 13.04.

BUG=none

Review URL: https://codereview.chromium.org/25385006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227782 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227782