Remove unused runtime setting notificationsenabled
Remove unused runtime setting notificationsenabled

This setting existed in WebKit but Chromium never changed it from its default value. We're removing all such unchanging settings in Blink, along with their associated code.

R=abarth@chromium.org
BUG=226711

Review URL: https://codereview.chromium.org/13879003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@148052 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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