Update the macro to control turning on NotificationsApiTest.TestPartialUpdate

We do not need a separate a bug to track the disabled notification test on Linux-aura.

BUG=319689
TEST=none

Review URL: https://codereview.chromium.org/118623006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242821 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242821