Provide WebContents::CreateParams to tab helpers.

headless/lib/browser/headless_web_contents_impl.cc

Index: headless/lib/browser/headless_web_contents_impl.cc
diff --git a/headless/lib/browser/headless_web_contents_impl.cc b/headless/lib/browser/headless_web_contents_impl.cc
index 36015b66c4cf675fbb05f33f643018e63daddb68..dbac704bcdda9978f331d4b88a2f74ca8f6a643a 100644
--- a/headless/lib/browser/headless_web_contents_impl.cc
+++ b/headless/lib/browser/headless_web_contents_impl.cc
@@ -75,12 +75,15 @@ class HeadlessWebContentsImpl::Delegate : public content::WebContentsDelegate {
   explicit Delegate(HeadlessBrowserContextImpl* browser_context)
       : browser_context_(browser_context) {}
 
-  void WebContentsCreated(content::WebContents* source_contents,
-                          int opener_render_process_id,
-                          int opener_render_frame_id,
-                          const std::string& frame_name,
-                          const GURL& target_url,
-                          content::WebContents* new_contents) override {
+  void WebContentsCreated(
+      content::WebContents* source_contents,
+      int opener_render_process_id,
+      int opener_render_frame_id,
+      const std::string& frame_name,
+      const GURL& target_url,
+      content::WebContents* new_contents,
+      const base::Optional<content::WebContents::CreateParams>& create_params)
+      override {
     std::unique_ptr<HeadlessWebContentsImpl> web_contents =
         HeadlessWebContentsImpl::CreateFromWebContents(new_contents,
                                                        browser_context_);