Make use of CreateInterfacePtrAndBind() where appropriate

chrome/browser/chromeos/arc/arc_auth_service.cc

Index: chrome/browser/chromeos/arc/arc_auth_service.cc
diff --git a/chrome/browser/chromeos/arc/arc_auth_service.cc b/chrome/browser/chromeos/arc/arc_auth_service.cc
index 5068550da19750ab584f498922c639929b9fd906..46a2cea720f2f280f36d5bb591665d685f3cd213 100644
--- a/chrome/browser/chromeos/arc/arc_auth_service.cc
+++ b/chrome/browser/chromeos/arc/arc_auth_service.cc
@@ -18,9 +18,8 @@ ArcAuthService::~ArcAuthService() {
 }
 
 void ArcAuthService::OnAuthInstanceReady() {
-  arc::AuthHostPtr host;
-  binding_.Bind(GetProxy(&host));
-  arc_bridge_service()->auth_instance()->Init(std::move(host));
+  arc_bridge_service()->auth_instance()->Init(
+      binding_.CreateInterfacePtrAndBind());
 }
 
 void ArcAuthService::GetAuthCode(const GetAuthCodeCallback& callback) {