Implement ServiceWorkerFetchDispatcher::MaybeStartNavigationPreload().

content/browser/renderer_host/render_process_host_impl.h

Index: content/browser/renderer_host/render_process_host_impl.h
diff --git a/content/browser/renderer_host/render_process_host_impl.h b/content/browser/renderer_host/render_process_host_impl.h
index f0e65706b88381decf2063ab18391153f6d6bd80..0d1986c673cd4752c658f02acffa9fa32500bcc0 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -77,7 +77,8 @@ class StoragePartitionImpl;
 
 namespace mojom {
 class StoragePartitionService;
-}
+class URLLoaderFactory;
+}  // namespace mojom
 
 typedef base::Thread* (*RendererMainThreadFactoryFunction)(
     const InProcessChildThreadParams& params);
@@ -379,6 +380,10 @@ class CONTENT_EXPORT RenderProcessHostImpl
 
   static void OnMojoError(int render_process_id, const std::string& error);
 
+  static bool CreateURLLoaderFactory(
+      base::WeakPtr<RenderProcessHostImpl> weak_host,
+      mojo::InterfaceRequest<mojom::URLLoaderFactory> request);
+
   template <typename InterfaceType>
   using AddInterfaceCallback =
       base::Callback<void(mojo::InterfaceRequest<InterfaceType>)>;