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

mojo/services/tracing/public/cpp/trace_provider_impl.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 "mojo/services/tracing/public/cpp/trace_provider_impl.h"
 
 #include <utility>
 
 #include "base/callback.h"
 #include "base/logging.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "base/trace_event/trace_config.h"
 #include "base/trace_event/trace_event.h"
 #include "mojo/shell/public/cpp/application_connection.h"
-#include "mojo/shell/public/cpp/application_impl.h"
 
 namespace mojo {
 
 TraceProviderImpl::TraceProviderImpl()
     : binding_(this), tracing_forced_(false), weak_factory_(this) {}
 
 TraceProviderImpl::~TraceProviderImpl() {}
 
 void TraceProviderImpl::Bind(InterfaceRequest<tracing::TraceProvider> request) {
   if (!binding_.is_bound()) {
@@ skipping 64 matching lines @@
   // events. Empty string is not a valid chunk to record so skip in this case.
   if (!events_str->data().empty()) {
     recorder_->Record(mojo::String(events_str->data()));
   }
   if (!has_more_events) {
     recorder_.reset();
   }
 }
 
 }  // namespace mojo