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This still leaves the old codepaths for the geofencing API in place, those will be cleaned up in a followup CL.

BUG=383125

Review URL: https://codereview.chromium.org/623813002

git-svn-id: svn://svn.chromium.org/blink/trunk@183931 bbb929c8-8fbe-4397-9dbb-9b2b20218538