Extract shell methods from ApplicationImpl into a base class, and pass this to Initialize() instead.

components/clipboard/clipboard_application_delegate.cc

 // 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.
 
 #include "components/clipboard/clipboard_application_delegate.h"
 
 #include <utility>
 
 #include "components/clipboard/clipboard_standalone_impl.h"
 #include "mojo/shell/public/cpp/application_connection.h"
 
 namespace clipboard {
 
 ClipboardApplicationDelegate::ClipboardApplicationDelegate() {}
 
 ClipboardApplicationDelegate::~ClipboardApplicationDelegate() {}
 
-void ClipboardApplicationDelegate::Initialize(mojo::ApplicationImpl* app) {
-  tracing_.Initialize(app);
+void ClipboardApplicationDelegate::Initialize(mojo::Shell* shell,
+                                              const std::string& url,
+                                              uint32_t id) {
+  tracing_.Initialize(shell, url);
 }
 
 bool ClipboardApplicationDelegate::AcceptConnection(
     mojo::ApplicationConnection* connection) {
   connection->AddService(this);
   return true;
 }
 
 void ClipboardApplicationDelegate::Create(
     mojo::ApplicationConnection* connection,
     mojo::InterfaceRequest<mojo::Clipboard> request) {
   // TODO(erg): Write native implementations of the clipboard. For now, we
   // just build a clipboard which doesn't interact with the system.
   new clipboard::ClipboardStandaloneImpl(std::move(request));
 }
 
 }  // namespace clipboard