Try to restore window.opener when opening blocked popups

content/public/browser/web_contents.h

Index: content/public/browser/web_contents.h
diff --git a/content/public/browser/web_contents.h b/content/public/browser/web_contents.h
index b7f67e46eaef8e423c4d24d3ff9753bdd5ed2de1..368c9d8f75de6998074e38e04f6d72a6c7a8e67b 100644
--- a/content/public/browser/web_contents.h
+++ b/content/public/browser/web_contents.h
@@ -98,7 +98,8 @@ class WebContents : public PageNavigator,
   // the SessionStorageNamespaceMap of the WebContents. This can happen if
   // you duplicate a WebContents, try to reconstitute it from a saved state,
   // or when you create a new WebContents based on another one (eg., when
-  // servicing a window.open() call).
+  // servicing a window.open() call). If |opener| is non-NULL, the created
+  // WebContents will have its opener set to |opener|.
   //
   // You do not want to call this. If you think you do, make sure you completely
   // understand when SessionStorageNamespace objects should be cloned, why
@@ -106,7 +107,8 @@ class WebContents : public PageNavigator,
   // can happen if you share the object.
   CONTENT_EXPORT static WebContents* CreateWithSessionStorage(
       const CreateParams& params,
-      const SessionStorageNamespaceMap& session_storage_namespace_map);
+      const SessionStorageNamespaceMap& session_storage_namespace_map,
+      WebContents* opener);
 
   // Adds/removes a callback called on creation of each new WebContents.
   typedef base::Callback<void(WebContents*)> CreatedCallback;