Make Tracing Service not use outgoing InterfaceProvider, update conventions

mash/example/views_examples/views_examples.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 <memory>
 
 #include "base/macros.h"
 #include "mash/public/interfaces/launchable.mojom.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
 #include "services/shell/public/c/main.h"
 #include "services/shell/public/cpp/connection.h"
 #include "services/shell/public/cpp/connector.h"
 #include "services/shell/public/cpp/service.h"
 #include "services/shell/public/cpp/service_runner.h"
-#include "services/tracing/public/cpp/tracing_impl.h"
+#include "services/tracing/public/cpp/provider.h"
 #include "ui/views/examples/example_base.h"
 #include "ui/views/examples/examples_window.h"
 #include "ui/views/mus/aura_init.h"
 #include "ui/views/mus/window_manager_connection.h"
 
 namespace views {
 class AuraInit;
 class WindowManagerConnection;
 }
 
@@ skipping 26 matching lines @@
   }
 
   // shell::InterfaceFactory<mash::mojom::Launchable>:
   void Create(const shell::Identity& remote_identity,
               mash::mojom::LaunchableRequest request) override {
     bindings_.AddBinding(this, std::move(request));
   }
 
   mojo::BindingSet<mash::mojom::Launchable> bindings_;
 
-  mojo::TracingImpl tracing_;
+  tracing::Provider tracing_;
   std::unique_ptr<views::AuraInit> aura_init_;
   std::unique_ptr<views::WindowManagerConnection> window_manager_connection_;
 
   DISALLOW_COPY_AND_ASSIGN(ViewsExamples);
 };
 
 MojoResult ServiceMain(MojoHandle service_request_handle) {
   return shell::ServiceRunner(new ViewsExamples).Run(service_request_handle);
 }