Use TraceProviderRegistry in //services/dart/dart_tracing.*.

mojo/common/tracing_impl.h

 // Copyright 2014 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 MOJO_COMMON_TRACING_IMPL_H_
 #define MOJO_COMMON_TRACING_IMPL_H_
 
 #include "base/macros.h"
 #include "mojo/common/trace_provider_impl.h"
-#include "mojo/public/cpp/application/service_provider_impl.h"
 
 namespace mojo {
 
 class ApplicationImpl;
 
 class TracingImpl {
  public:
   TracingImpl();
   ~TracingImpl();
 
   // This connects to the tracing service and registers ourselves to provide
   // tracing data on demand.
   void Initialize(ApplicationImpl* app);
 
  private:
   TraceProviderImpl provider_impl_;
 
   DISALLOW_COPY_AND_ASSIGN(TracingImpl);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_COMMON_TRACING_IMPL_H_