First cut at "content handling" support in Mojo.

mojo/service_manager/service_manager_unittest.cc

Index: mojo/service_manager/service_manager_unittest.cc
diff --git a/mojo/service_manager/service_manager_unittest.cc b/mojo/service_manager/service_manager_unittest.cc
index 8f7d83d01347e9de4cd31a6e3e3b309ee820d06a..9ab8634e9a845c23b6fe194b35bf1da142dc3791 100644
--- a/mojo/service_manager/service_manager_unittest.cc
+++ b/mojo/service_manager/service_manager_unittest.cc
@@ -121,9 +121,10 @@ class TestServiceLoader : public ServiceLoader,
   virtual void LoadService(
       ServiceManager* manager,
       const GURL& url,
-      ScopedMessagePipeHandle service_provider_handle) OVERRIDE {
+      scoped_refptr<LoadServiceCallbacks> callbacks) OVERRIDE {
     ++num_loads_;
-    test_app_.reset(new ApplicationImpl(this, service_provider_handle.Pass()));
+    test_app_.reset(
+        new ApplicationImpl(this, callbacks->RegisterApplication().Pass()));
   }
 
   virtual void OnServiceError(ServiceManager* manager,
@@ -335,8 +336,9 @@ class Tester : public ApplicationDelegate,
   virtual void LoadService(
       ServiceManager* manager,
       const GURL& url,
-      ScopedMessagePipeHandle shell_handle) OVERRIDE {
-    app_.reset(new ApplicationImpl(this, shell_handle.Pass()));
+      scoped_refptr<LoadServiceCallbacks> callbacks) OVERRIDE {
+    app_.reset(
+        new ApplicationImpl(this, callbacks->RegisterApplication().Pass()));
   }
 
   virtual void OnServiceError(ServiceManager* manager,