ServiceWorker: add ServiceWorkerClients.claim() support (2/3).

content/child/service_worker/service_worker_dispatcher.cc

Index: content/child/service_worker/service_worker_dispatcher.cc
diff --git a/content/child/service_worker/service_worker_dispatcher.cc b/content/child/service_worker/service_worker_dispatcher.cc
index 0a30cfbb25c612454d851c7cfcfe20f34762a9f7..77116f324fd5a65ca7e6bedbd32e5f739aa81488 100644
--- a/content/child/service_worker/service_worker_dispatcher.cc
+++ b/content/child/service_worker/service_worker_dispatcher.cc
@@ -323,11 +323,11 @@ void ServiceWorkerDispatcher::OnDisassociateRegistration(
   ProviderContextMap::iterator provider = provider_contexts_.find(provider_id);
   if (provider == provider_contexts_.end())
     return;
-  provider->second->OnDisassociateRegistration();
   worker_to_provider_.erase(provider->second->installing_handle_id());
   worker_to_provider_.erase(provider->second->waiting_handle_id());
   worker_to_provider_.erase(provider->second->active_handle_id());
   worker_to_provider_.erase(provider->second->controller_handle_id());
+  provider->second->OnDisassociateRegistration();
 }
 
 void ServiceWorkerDispatcher::OnRegistered(