Provide WebContents::CreateParams to tab helpers.

chrome/browser/prerender/prerender_contents.cc

Index: chrome/browser/prerender/prerender_contents.cc
diff --git a/chrome/browser/prerender/prerender_contents.cc b/chrome/browser/prerender/prerender_contents.cc
index 224d790fc806161755db7002a5f4498d9a45f2fc..90242fb455883aba8fa3494a32cd288f9e61830c 100644
--- a/chrome/browser/prerender/prerender_contents.cc
+++ b/chrome/browser/prerender/prerender_contents.cc
@@ -287,8 +287,11 @@ void PrerenderContents::StartPrerendering(
 
   prerendering_has_started_ = true;
 
-  prerender_contents_.reset(CreateWebContents(session_storage_namespace));
-  TabHelpers::AttachTabHelpers(prerender_contents_.get());
+  content::WebContents::CreateParams create_params =
+      WebContents::CreateParams(profile_);
+  prerender_contents_.reset(
+      CreateWebContents(create_params, session_storage_namespace));
+  TabHelpers::AttachTabHelpers(prerender_contents_.get(), create_params);
   content::WebContentsObserver::Observe(prerender_contents_.get());
 
   // Tag the prerender contents with the task manager specific prerender tag, so
@@ -447,13 +450,14 @@ void PrerenderContents::OnRenderViewHostCreated(
 }
 
 WebContents* PrerenderContents::CreateWebContents(
+    const content::WebContents::CreateParams& create_params,
     SessionStorageNamespace* session_storage_namespace) {
   // TODO(ajwong): Remove the temporary map once prerendering is aware of
   // multiple session storage namespaces per tab.
   content::SessionStorageNamespaceMap session_storage_namespace_map;
   session_storage_namespace_map[std::string()] = session_storage_namespace;
-  return WebContents::CreateWithSessionStorage(
-      WebContents::CreateParams(profile_), session_storage_namespace_map);
+  return WebContents::CreateWithSessionStorage(create_params,
+                                               session_storage_namespace_map);
 }
 
 void PrerenderContents::NotifyPrerenderStart() {