Fix a crash when receiving PAUSE action but no service is routed

content/browser/media/session/media_session_impl.cc

Index: content/browser/media/session/media_session_impl.cc
diff --git a/content/browser/media/session/media_session_impl.cc b/content/browser/media/session/media_session_impl.cc
index c3025c1661a655fb7b0bbc1149b2cab8cc111d71..f5069844108a35e99fcc2157494113f37dbbac71 100644
--- a/content/browser/media/session/media_session_impl.cc
+++ b/content/browser/media/session/media_session_impl.cc
@@ -646,7 +646,7 @@ void MediaSessionImpl::DidReceiveAction(
   // https://crbug.com/596516.
   if (blink::mojom::MediaSessionAction::PAUSE == action) {
     RenderFrameHost* rfh_of_routed_service =
-        routed_service_->GetRenderFrameHost();
+        routed_service_ ? routed_service_->GetRenderFrameHost() : nullptr;
     for (const auto& player : normal_players_) {
       if (player.observer->GetRenderFrameHost() != rfh_of_routed_service)
         player.observer->OnSuspend(player.player_id);