<webview>: Resolve relative paths as chrome-extension: URLs

chrome/browser/guestview/adview/adview_guest.h

Index: chrome/browser/guestview/adview/adview_guest.h
diff --git a/chrome/browser/guestview/adview/adview_guest.h b/chrome/browser/guestview/adview/adview_guest.h
index 932736342ced59b52f0f58d502f5cc4b4bd0fbf6..3d8a9aa01c56cb0371f3a14342f526c59c327acf 100644
--- a/chrome/browser/guestview/adview/adview_guest.h
+++ b/chrome/browser/guestview/adview/adview_guest.h
@@ -19,7 +19,8 @@
 class AdViewGuest : public GuestView,
                     public content::WebContentsObserver {
  public:
-  explicit AdViewGuest(content::WebContents* guest_web_contents);
+  AdViewGuest(content::WebContents* guest_web_contents,
+              const std::string& extension_id);
 
   static AdViewGuest* From(int embedder_process_id, int instance_id);