Privatize StrongBinding lifetime management

content/renderer/background_sync/background_sync_client_impl.cc

Index: content/renderer/background_sync/background_sync_client_impl.cc
diff --git a/content/renderer/background_sync/background_sync_client_impl.cc b/content/renderer/background_sync/background_sync_client_impl.cc
index f4b7d9372a0b8801d33c68ab9d8abbfcb7f52909..e00c704ebb523ab3885b204124207da983f941a1 100644
--- a/content/renderer/background_sync/background_sync_client_impl.cc
+++ b/content/renderer/background_sync/background_sync_client_impl.cc
@@ -10,6 +10,7 @@
 #include "content/child/background_sync/background_sync_provider.h"
 #include "content/child/background_sync/background_sync_type_converters.h"
 #include "content/renderer/service_worker/service_worker_context_client.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
 #include "third_party/WebKit/public/platform/Platform.h"
 #include "third_party/WebKit/public/platform/WebThread.h"
 #include "third_party/WebKit/public/platform/modules/background_sync/WebSyncProvider.h"
@@ -21,14 +22,13 @@ namespace content {
 // static
 void BackgroundSyncClientImpl::Create(
     mojo::InterfaceRequest<blink::mojom::BackgroundSyncServiceClient> request) {
-  new BackgroundSyncClientImpl(std::move(request));
+  mojo::MakeStrongBinding(base::WrapUnique(new BackgroundSyncClientImpl),
+                          std::move(request));
 }
 
 BackgroundSyncClientImpl::~BackgroundSyncClientImpl() {}
 
-BackgroundSyncClientImpl::BackgroundSyncClientImpl(
-    mojo::InterfaceRequest<blink::mojom::BackgroundSyncServiceClient> request)
-    : binding_(this, std::move(request)) {}
+BackgroundSyncClientImpl::BackgroundSyncClientImpl() {}
 
 void BackgroundSyncClientImpl::Sync(
     const mojo::String& tag,