PlzNavigate: Make ServiceWorker work with PlzNavigate.

content/browser/service_worker/service_worker_context_wrapper.cc

Index: content/browser/service_worker/service_worker_context_wrapper.cc
diff --git a/content/browser/service_worker/service_worker_context_wrapper.cc b/content/browser/service_worker/service_worker_context_wrapper.cc
index e08b37e0a8fc61071c0788c717c890ee9efea35b..db815453bc75979b42a0dc66af688f8bb381c94c 100644
--- a/content/browser/service_worker/service_worker_context_wrapper.cc
+++ b/content/browser/service_worker/service_worker_context_wrapper.cc
@@ -625,6 +625,13 @@ void ServiceWorkerContextWrapper::RemoveObserver(
   observer_list_->RemoveObserver(observer);
 }
 
+void ServiceWorkerContextWrapper::RemoveNavigationProviderHost(
+    int provider_id) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  if (context_core_)

[michaeln, 2015/10/08 02:18:51]

nit: for consistency, it'd be good to phrase this as an early return, if
(!context_core_) return. There are a couple dozen existing weakptr tests of this
form and none of the other.

+    context_core_->RemoveNavigationProviderHost(provider_id);
+}
+
 void ServiceWorkerContextWrapper::InitInternal(
     const base::FilePath& user_data_directory,
     scoped_ptr<ServiceWorkerDatabaseTaskManager> database_task_manager,