Make Tracing Service not use outgoing InterfaceProvider, update conventions

services/tracing/public/cpp/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 SERVICES_TRACING_PUBLIC_CPP_TRACING_IMPL_H_
-#define SERVICES_TRACING_PUBLIC_CPP_TRACING_IMPL_H_
-
-#include "base/macros.h"
-#include "services/shell/public/cpp/interface_factory.h"
-#include "services/tracing/public/cpp/trace_provider_impl.h"
-#include "services/tracing/public/interfaces/tracing.mojom.h"
-
-namespace shell {
-class Connection;
-class Connector;
-}
-
-namespace mojo {
-
-// Connects to mojo:tracing during your Service's OnStart() call once per
-// process.
-class TracingImpl : public shell::InterfaceFactory<tracing::TraceProvider> {
- public:
-  TracingImpl();
-  ~TracingImpl() override;
-
-  // Connect to the Tracing service & provide tracing data on demand.
-  void Initialize(shell::Connector* connector, const std::string& url);
-
- private:
-  // InterfaceFactory<tracing::TraceProvider> implementation.
-  void Create(const shell::Identity& remote_identity,
-              tracing::TraceProviderRequest request) override;
-
-  std::unique_ptr<shell::Connection> connection_;
-  TraceProviderImpl provider_impl_;
-
-  DISALLOW_COPY_AND_ASSIGN(TracingImpl);
-};
-
-}  // namespace mojo
-
-#endif  // SERVICES_TRACING_PUBLIC_CPP_TRACING_IMPL_H_