Privatize StrongBinding lifetime management

extensions/browser/api/display_source/wifi_display/wifi_display_session_service_impl.cc

Index: extensions/browser/api/display_source/wifi_display/wifi_display_session_service_impl.cc
diff --git a/extensions/browser/api/display_source/wifi_display/wifi_display_session_service_impl.cc b/extensions/browser/api/display_source/wifi_display/wifi_display_session_service_impl.cc
index 7a402b97b4fea686a53345be661bca8f41896c7c..9bd6fec3f7dd437867c97cc54d264f90420a7c5d 100644
--- a/extensions/browser/api/display_source/wifi_display/wifi_display_session_service_impl.cc
+++ b/extensions/browser/api/display_source/wifi_display/wifi_display_session_service_impl.cc
@@ -7,6 +7,7 @@
 #include "base/bind.h"
 #include "content/public/browser/browser_context.h"
 #include "extensions/browser/api/display_source/display_source_connection_delegate_factory.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
 
 namespace {
 const char kErrorCannotHaveMultipleSessions[] =
@@ -19,10 +20,8 @@ namespace extensions {
 using namespace api::display_source;
 
 WiFiDisplaySessionServiceImpl::WiFiDisplaySessionServiceImpl(
-    DisplaySourceConnectionDelegate* delegate,
-    mojo::InterfaceRequest<WiFiDisplaySessionService> request)
-    : binding_(this, std::move(request)),
-      delegate_(delegate),
+    DisplaySourceConnectionDelegate* delegate)
+    : delegate_(delegate),
       sink_state_(SINK_STATE_NONE),
       sink_id_(DisplaySourceConnectionDelegate::kInvalidSinkId),
       weak_factory_(this) {
@@ -42,8 +41,9 @@ void WiFiDisplaySessionServiceImpl::BindToRequest(
       DisplaySourceConnectionDelegateFactory::GetForBrowserContext(
           browser_context);
   CHECK(delegate);
-
-  new WiFiDisplaySessionServiceImpl(delegate, std::move(request));
+  mojo::MakeStrongBinding(
+      base::MakeUnique<WiFiDisplaySessionServiceImpl>(delegate),
+      std::move(request));
 }
 
 void WiFiDisplaySessionServiceImpl::SetClient(