Convert most geolocation layout tests to use a JS mock implementation.

third_party/WebKit/LayoutTests/fast/dom/Geolocation/script-tests/position-string.js

 description("Tests formatting of position.toString().");
 
 var mockLatitude = 51.478;
 var mockLongitude = -0.166;
 var mockAccuracy = 100.0;
 
-if (!window.testRunner || !window.internals)
-    debug('This test can not run without testRunner or internals');
-
-internals.setGeolocationClientMock(document);
-internals.setGeolocationPermission(document, true);
-internals.setGeolocationPosition(document,
-                                 mockLatitude,
-                                 mockLongitude,
-                                 mockAccuracy);
+if (!window.testRunner || !window.mojo)
+    debug('This test can not run without testRunner or mojo');
 
 var position;
-navigator.geolocation.getCurrentPosition(function(p) {
-    // shouldBe can't use local variables yet.
-    position = p;
-    shouldBe('position.coords.latitude', 'mockLatitude');
-    shouldBe('position.coords.longitude', 'mockLongitude');
-    shouldBe('position.coords.accuracy', 'mockAccuracy');
-    shouldBe('position.toString()', '"[object Geoposition]"');
-    shouldBe('position.coords.toString()', '"[object Coordinates]"');
-    finishJSTest();
-}, function(e) {
-    testFailed('Error callback invoked unexpectedly');
-    finishJSTest();
+
+geolocationServiceMock.then(mock => {
+    mock.setGeolocationPermission(true);
+    mock.setGeolocationPosition(mockLatitude,
+                                mockLongitude,
+                                mockAccuracy);
+
+    navigator.geolocation.getCurrentPosition(function(p) {
+        // shouldBe can't use local variables yet.
+        position = p;
+        shouldBe('position.coords.latitude', 'mockLatitude');
+        shouldBe('position.coords.longitude', 'mockLongitude');
+        shouldBe('position.coords.accuracy', 'mockAccuracy');
+        shouldBe('position.toString()', '"[object Geoposition]"');
+        shouldBe('position.coords.toString()', '"[object Coordinates]"');
+        finishJSTest();
+    }, function(e) {
+        testFailed('Error callback invoked unexpectedly');
+        finishJSTest();
+    });
 });
 
 window.jsTestIsAsync = true;