Convert ConnectToApplication to take a params class

mandoline/ui/desktop_ui/browser_manager.cc

Index: mandoline/ui/desktop_ui/browser_manager.cc
diff --git a/mandoline/ui/desktop_ui/browser_manager.cc b/mandoline/ui/desktop_ui/browser_manager.cc
index 1049472e63536be95998afe42651e4d68b5c7122..7eac4d9c752740db0f5f489574d34096012fd62d 100644
--- a/mandoline/ui/desktop_ui/browser_manager.cc
+++ b/mandoline/ui/desktop_ui/browser_manager.cc
@@ -51,9 +51,7 @@ void BrowserManager::Initialize(mojo::ApplicationImpl* app) {
   app_ = app;
   tracing_.Initialize(app);
 
-  mojo::URLRequestPtr request(mojo::URLRequest::New());
-  request->url = "mojo:mus";
-  app_->ConnectToService(request.Pass(), &host_factory_);
+  app_->ConnectToService("mojo:mus", &host_factory_);
 
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   // Create a Browser for each valid URL in the command line.