Privatize StrongBinding lifetime management

components/startup_metric_utils/browser/startup_metric_host_impl.cc

Index: components/startup_metric_utils/browser/startup_metric_host_impl.cc
diff --git a/components/startup_metric_utils/browser/startup_metric_host_impl.cc b/components/startup_metric_utils/browser/startup_metric_host_impl.cc
index ad4d6fd9f02fc987958ec3a91c4ad0561e67451a..d64d62602bc592208cbe3107392a0f6c0488fbdc 100644
--- a/components/startup_metric_utils/browser/startup_metric_host_impl.cc
+++ b/components/startup_metric_utils/browser/startup_metric_host_impl.cc
@@ -5,19 +5,20 @@
 #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 {
-// static
-void StartupMetricHostImpl::Create(mojom::StartupMetricHostRequest request) {
-  new StartupMetricHostImpl(std::move(request));
-}
 
-StartupMetricHostImpl::StartupMetricHostImpl(
-    mojom::StartupMetricHostRequest request)
-    : binding_(this, std::move(request)) {}
+StartupMetricHostImpl::StartupMetricHostImpl() = default;
 
 StartupMetricHostImpl::~StartupMetricHostImpl() = default;
 
+// static
+void StartupMetricHostImpl::Create(mojom::StartupMetricHostRequest request) {
+  mojo::MakeStrongBinding(base::MakeUnique<StartupMetricHostImpl>(),
+                          std::move(request));
+}
+
 void StartupMetricHostImpl::RecordRendererMainEntryTime(
     base::TimeTicks renderer_main_entry_time) {
   startup_metric_utils::RecordRendererMainEntryTime(renderer_main_entry_time);