Privatize StrongBinding lifetime management

components/startup_metric_utils/browser/startup_metric_host_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 "components/startup_metric_utils/browser/startup_metric_host_impl.h"
 
 #include "components/startup_metric_utils/browser/startup_metric_utils.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
 
 namespace startup_metric_utils {
+
+StartupMetricHostImpl::StartupMetricHostImpl() = default;
+
+StartupMetricHostImpl::~StartupMetricHostImpl() = default;
+
 // static
 void StartupMetricHostImpl::Create(mojom::StartupMetricHostRequest request) {
-  new StartupMetricHostImpl(std::move(request));
+  mojo::MakeStrongBinding(base::MakeUnique<StartupMetricHostImpl>(),
+                          std::move(request));
 }
 
-StartupMetricHostImpl::StartupMetricHostImpl(
-    mojom::StartupMetricHostRequest request)
-    : binding_(this, std::move(request)) {}
-
-StartupMetricHostImpl::~StartupMetricHostImpl() = default;
-
 void StartupMetricHostImpl::RecordRendererMainEntryTime(
     base::TimeTicks renderer_main_entry_time) {
   startup_metric_utils::RecordRendererMainEntryTime(renderer_main_entry_time);
 }
 
 }  // namespace startup_metric_utils