Make TracingImpl take a Shell* and args, instead of an ApplicationImpl*.

services/dart/dart_tracing.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 SERVICES_DART_DART_TRACING_H_
 #define SERVICES_DART_DART_TRACING_H_
 
 #include "base/trace_event/trace_event.h"
 #include "mojo/common/tracing_impl.h"
 #include "mojo/public/cpp/bindings/interface_request.h"
@@ skipping 30 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(DartTraceProvider);
 };
 
 class DartTracingImpl {
  public:
   DartTracingImpl();
   ~DartTracingImpl();
 
   // This connects to the tracing service and registers ourselves to provide
   // tracing data on demand.
-  void Initialize(mojo::ApplicationImpl* app);
+  void Initialize(mojo::Shell* shell);
 
  private:
   DartTraceProvider provider_impl_;
 
   DISALLOW_COPY_AND_ASSIGN(DartTracingImpl);
 };
 
 }  // namespace dart
 
 #endif  // SERVICES_DART_DART_TRACING_H_