Update the PushEvent to have a nullable PushMessageData

content/browser/service_worker/embedded_worker_test_helper.h

Index: content/browser/service_worker/embedded_worker_test_helper.h
diff --git a/content/browser/service_worker/embedded_worker_test_helper.h b/content/browser/service_worker/embedded_worker_test_helper.h
index a95454a94903d32d6dd4bbe423b7347b2c7eed0f..b37cd1a7a7d7f4238515dc7321ac66c2c647fb50 100644
--- a/content/browser/service_worker/embedded_worker_test_helper.h
+++ b/content/browser/service_worker/embedded_worker_test_helper.h
@@ -30,6 +30,7 @@ class EmbeddedWorkerRegistry;
 class EmbeddedWorkerTestHelper;
 class MessagePortMessageFilter;
 class MockRenderProcessHost;
+struct PushEventPayload;
 class ServiceWorkerContextCore;
 class ServiceWorkerContextWrapper;
 struct ServiceWorkerFetchRequest;
@@ -116,7 +117,7 @@ class EmbeddedWorkerTestHelper : public IPC::Sender,
                             const ServiceWorkerFetchRequest& request);
   virtual void OnPushEvent(int embedded_worker_id,
                            int request_id,
-                           const std::string& data);
+                           const PushEventPayload& data);
 
   // These functions simulate sending an EmbeddedHostMsg message to the
   // browser.
@@ -143,7 +144,7 @@ class EmbeddedWorkerTestHelper : public IPC::Sender,
   void OnInstallEventStub(int request_id);
   void OnFetchEventStub(int request_id,
                         const ServiceWorkerFetchRequest& request);
-  void OnPushEventStub(int request_id, const std::string& data);
+  void OnPushEventStub(int request_id, const PushEventPayload& payload);
   void OnSetupMojoStub(int thread_id,
                        mojo::InterfaceRequest<mojo::ServiceProvider> services,
                        mojo::ServiceProviderPtr exposed_services);