First cut at "content handling" support in Mojo.

mojo/shell/network_service_loader.h

Index: mojo/shell/network_service_loader.h
diff --git a/mojo/shell/network_service_loader.h b/mojo/shell/network_service_loader.h
index 2184072f6152a2b783f80060645b243249a3e3cf..0eab765acdae713f8478b485b86a44b9c78568a5 100644
--- a/mojo/shell/network_service_loader.h
+++ b/mojo/shell/network_service_loader.h
@@ -31,10 +31,9 @@ class NetworkServiceLoader : public ServiceLoader,
 
  private:
   // ServiceLoader overrides:
-  virtual void LoadService(
-      ServiceManager* manager,
-      const GURL& url,
-      ScopedMessagePipeHandle shell_handle) OVERRIDE;
+  virtual void Load(ServiceManager* manager,
+                    const GURL& url,
+                    scoped_refptr<LoadCallbacks> callbacks) OVERRIDE;
   virtual void OnServiceError(ServiceManager* manager,
                               const GURL& url) OVERRIDE;