Make Tracing Service not use outgoing InterfaceProvider, update conventions

components/filesystem/file_system_app.h

 // Copyright 2015 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.
 
 #ifndef COMPONENTS_FILESYSTEM_FILE_SYSTEM_APP_H_
 #define COMPONENTS_FILESYSTEM_FILE_SYSTEM_APP_H_
 
 #include "base/macros.h"
 #include "components/filesystem/directory_impl.h"
 #include "components/filesystem/file_system_impl.h"
 #include "components/filesystem/lock_table.h"
 #include "components/filesystem/public/interfaces/file_system.mojom.h"
 #include "services/shell/public/cpp/interface_factory.h"
 #include "services/shell/public/cpp/service.h"
-#include "services/tracing/public/cpp/tracing_impl.h"
+#include "services/tracing/public/cpp/provider.h"
 
 namespace mojo {
 class Connector;
 }
 
 namespace filesystem {
 
 class FileSystemApp : public shell::Service,
                       public shell::InterfaceFactory<mojom::FileSystem> {
  public:
   FileSystemApp();
   ~FileSystemApp() override;
 
  private:
   // Gets the system specific toplevel profile directory.
   static base::FilePath GetUserDataDir();
 
   // |shell::Service| override:
   void OnStart(const shell::Identity& identity) override;
   bool OnConnect(shell::Connection* connection) override;
 
   // |InterfaceFactory<Files>| implementation:
   void Create(const shell::Identity& remote_identity,
               mojo::InterfaceRequest<mojom::FileSystem> request) override;
 
-  mojo::TracingImpl tracing_;
+  tracing::Provider tracing_;
 
   scoped_refptr<LockTable> lock_table_;
 
   DISALLOW_COPY_AND_ASSIGN(FileSystemApp);
 };
 
 }  // namespace filesystem
 
 #endif  // COMPONENTS_FILESYSTEM_FILE_SYSTEM_APP_H_