Support Service Worker NavigationPreload with PlzNavigate.

content/browser/service_worker/service_worker_fetch_dispatcher.h

Index: content/browser/service_worker/service_worker_fetch_dispatcher.h
diff --git a/content/browser/service_worker/service_worker_fetch_dispatcher.h b/content/browser/service_worker/service_worker_fetch_dispatcher.h
index e6985500f85171c1b8df3c7e25ea1d9f507fd552..59b41da850e2fa3800df386c9f6ec1a8585e8e37 100644
--- a/content/browser/service_worker/service_worker_fetch_dispatcher.h
+++ b/content/browser/service_worker/service_worker_fetch_dispatcher.h
@@ -22,6 +22,7 @@ class URLRequest;
 
 namespace content {
 
+class ServiceWorkerProviderHost;
 class ServiceWorkerVersion;
 
 // A helper class to dispatch fetch event to a service worker.
@@ -44,7 +45,9 @@ class CONTENT_EXPORT ServiceWorkerFetchDispatcher {
 
   // If appropriate, starts the navigation preload request and creates
   // |preload_handle_|.
-  void MaybeStartNavigationPreload(net::URLRequest* original_request);
+  void MaybeStartNavigationPreload(
+      net::URLRequest* original_request,
+      base::WeakPtr<ServiceWorkerProviderHost> provider_host);
 
   // Dispatches a fetch event to the |version| given in ctor, and fires
   // |fetch_callback| (also given in ctor) when finishes. It runs