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 b1abb79aa04bbc026eb3bafc61782a1a98084ab2..8a98bed8e2af3700b5e9b754b8c39e06917538dc 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,
@@ -328,8 +329,9 @@ 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,