Provide WebContents::CreateParams to tab helpers.

chrome/browser/page_load_metrics/page_load_metrics_initialize.cc

Index: chrome/browser/page_load_metrics/page_load_metrics_initialize.cc
diff --git a/chrome/browser/page_load_metrics/page_load_metrics_initialize.cc b/chrome/browser/page_load_metrics/page_load_metrics_initialize.cc
index 5b9d15cd189b2a26c44e462b9e9f85a65a74cab7..ac444105c327d1a8bae30dbb0be3d2c869ec643b 100644
--- a/chrome/browser/page_load_metrics/page_load_metrics_initialize.cc
+++ b/chrome/browser/page_load_metrics/page_load_metrics_initialize.cc
@@ -153,9 +153,11 @@ bool PageLoadMetricsEmbedder::IsNewTabPageUrl(const GURL& url) {
 }  // namespace
 
 void InitializePageLoadMetricsForWebContents(
-    content::WebContents* web_contents) {
+    content::WebContents* web_contents,
+    const base::Optional<content::WebContents::CreateParams>& create_params) {
   page_load_metrics::MetricsWebContentsObserver::CreateForWebContents(
-      web_contents, base::MakeUnique<PageLoadMetricsEmbedder>(web_contents));
+      web_contents, create_params,
+      base::MakeUnique<PageLoadMetricsEmbedder>(web_contents));
 }
 
 }  // namespace chrome