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

services/test_service/test_service_impl.h

Index: services/test_service/test_service_impl.h
diff --git a/services/test_service/test_service_impl.h b/services/test_service/test_service_impl.h
index df5803c64c38c4bb31495a58ce339a307756c69b..92f0b912278e8e1a7b44c022ab694084424cd51a 100644
--- a/services/test_service/test_service_impl.h
+++ b/services/test_service/test_service_impl.h
@@ -11,7 +11,6 @@
 #include "services/test_service/test_service.mojom.h"
 
 namespace mojo {
-class ApplicationImpl;
 namespace test {
 
 class TrackedService;
@@ -19,8 +18,7 @@ class TestServiceApplication;
 
 class TestServiceImpl : public TestService {
  public:
-  TestServiceImpl(ApplicationImpl* app_impl,
-                  TestServiceApplication* application,
+  TestServiceImpl(TestServiceApplication* application,
                   InterfaceRequest<TestService> request);
   ~TestServiceImpl() override;
 
@@ -33,7 +31,6 @@ class TestServiceImpl : public TestService {
 
  private:
   TestServiceApplication* const application_;
-  ApplicationImpl* const app_impl_;
   TestTimeServicePtr time_service_;
   scoped_ptr<TrackedService> tracking_;
   StrongBinding<TestService> binding_;