First step to refactor ServiceWorkerVersion to make event dispatching more modular.

content/public/test/mock_render_process_host.cc

Index: content/public/test/mock_render_process_host.cc
diff --git a/content/public/test/mock_render_process_host.cc b/content/public/test/mock_render_process_host.cc
index f6ced4c97f6299c312c97ac963a17e8aafaca658..b99549bbbe74083ee208f8a2fa0b9c073e09ed19 100644
--- a/content/public/test/mock_render_process_host.cc
+++ b/content/public/test/mock_render_process_host.cc
@@ -264,7 +264,7 @@ void MockRenderProcessHost::NotifyTimezoneChange(const std::string& zone_id) {
 }
 
 ServiceRegistry* MockRenderProcessHost::GetServiceRegistry() {
-  return NULL;
+  return service_registry_.get();
 }
 
 const base::TimeTicks& MockRenderProcessHost::GetInitTimeForNavigationMetrics()