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

content/renderer/geolocation_dispatcher.h

Index: content/renderer/geolocation_dispatcher.h
diff --git a/content/renderer/geolocation_dispatcher.h b/content/renderer/geolocation_dispatcher.h
index 437c5a8c06ae6407f72f1b5fb68e2cc2d2ef0f1c..8d8d9d217c809f358ae95d328d3272a1edb11c06 100644
--- a/content/renderer/geolocation_dispatcher.h
+++ b/content/renderer/geolocation_dispatcher.h
@@ -54,6 +54,7 @@ class GeolocationDispatcher
 
   std::unique_ptr<blink::WebGeolocationController> controller_;
 
+  size_t num_pending_permission_requests_ = 0;
   std::unique_ptr<blink::WebGeolocationPermissionRequestManager>
       pending_permissions_;
   blink::mojom::GeolocationServicePtr geolocation_service_;