Make ServiceRegistry (which implements) ApplicationConnection just wrap a ServiceProviderImpl.

mojo/public/cpp/application/tests/service_provider_impl_unittest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/public/cpp/application/service_provider_impl.h"
 
 #include <utility>
 
 #include "mojo/public/cpp/application/connect.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
@@ skipping 320 matching lines @@
     loop().Run();
   }
   loop().RunUntilIdle();  // Run stuff caused by destructors.
 
   sp.reset();
   loop().RunUntilIdle();
 
   EXPECT_FALSE(was_run);
 }
 
+TEST_F(ServiceProviderImplTest, ConstructRequestNotPending) {
+  ServiceProviderImpl impl(ConnectionContext(ConnectionContext::Type::INCOMING,
+                                             "https://example.com/remote.mojo",
+                                             "https://example.com/me.mojo"),
+                           InterfaceRequest<ServiceProvider>());
+  EXPECT_EQ(ConnectionContext::Type::UNKNOWN, impl.connection_context().type);
+  EXPECT_EQ(std::string(), impl.connection_context().remote_url);
+  EXPECT_EQ(std::string(), impl.connection_context().connection_url);
+}
+
 // TODO(vtl): Explicitly test |AddServiceForName()|?
 
 }  // namespace
 }  // namespace mojo