Add a mojo::RunApplication() for running implementations of ApplicationImplBase.

services/test_service/test_request_tracker_application.h

Index: services/test_service/test_request_tracker_application.h
diff --git a/services/test_service/test_request_tracker_application.h b/services/test_service/test_request_tracker_application.h
index 53a01bfac0fad5ae1ff780120e85f20a61b6e103..8ffa83e92958a986c3e0cd518a48e4139b895d6f 100644
--- a/services/test_service/test_request_tracker_application.h
+++ b/services/test_service/test_request_tracker_application.h
@@ -5,29 +5,25 @@
 #ifndef SERVICES_TEST_SERVICE_TEST_REQUEST_TRACKER_APPLICATION_H_
 #define SERVICES_TEST_SERVICE_TEST_REQUEST_TRACKER_APPLICATION_H_
 
-#include "mojo/public/cpp/application/application_delegate.h"
+#include "mojo/public/cpp/application/application_impl_base.h"
 #include "mojo/public/cpp/system/macros.h"
 #include "services/test_service/test_request_tracker_impl.h"
 
 namespace mojo {
-class ApplicationImpl;
 namespace test {
+
 class TestTimeService;
 
 // Embeds TestRequestTracker mojo services into an application.
-class TestRequestTrackerApplication : public ApplicationDelegate {
+class TestRequestTrackerApplication : public ApplicationImplBase {
  public:
   TestRequestTrackerApplication();
   ~TestRequestTrackerApplication() override;
 
-  void Initialize(ApplicationImpl* app) override;
-
-  // ApplicationDelegate methods:
-  bool ConfigureIncomingConnection(
-      ServiceProviderImpl* service_provider_impl) override;
+  // |ApplicationImplBase| method:
+  bool OnAcceptConnection(ServiceProviderImpl* service_provider_impl) override;
 
  private:
-  ApplicationImpl* app_impl_;
   TrackingContext context_;
   MOJO_DISALLOW_COPY_AND_ASSIGN(TestRequestTrackerApplication);
 };