Move all geofencing code into its own module separate from geolocation.

LayoutTests/http/tests/geofencing/resources/worker.js

+self.onmessage = function(e) {
+    var message = e.data;
+    if ('port' in message) {
+        port = message.port;
+        nextTest(port);
+    }
+};
+
+var tests = [
+    function() {
+        return navigator.geofencing.registerRegion(new CircularRegion({latitude: 37.421999, longitude: -122.084015}));
+    },
+    function() {
+        return navigator.geofencing.unregisterRegion("");
+    },
+    function() {
+        return navigator.geofencing.getRegisteredRegions();
+    }
+];
+
+function nextTest(port) {
+    if (tests.length == 0) {
+        port.postMessage('quit');
+        self.close();
+        return;
+    }
+    var test = tests.shift();
+    try {
+        test()
+        .then(function() {
+            port.postMessage('Resolved');
+            nextTest(port);
+        }).catch(function(e) {
+            port.postMessage('Rejected: ' + e.message);
+            nextTest(port);
+        });
+    } catch (e) {
+        port.postMessage('Exception: ' + e);
+        nextTest(port);
+    }
+}