FrameTree::Find only searches relative to local frames.

third_party/WebKit/Source/core/frame/Frame.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Simon Hausmann <hausmann@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  *                     2001 George Staikos <staikos@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2005 Alexey Proskuryakov <ap@nypop.com>
@@ skipping 113 matching lines @@
   DEFINE_STATIC_LOCAL(EmptyChromeClient, client, (EmptyChromeClient::Create()));
   return client;
 }
 
 ChromeClient& Frame::GetChromeClient() const {
   if (Page* page = this->GetPage())
     return page->GetChromeClient();
   return GetEmptyChromeClient();
 }
 
-Frame* Frame::FindFrameForNavigation(const AtomicString& name,
-                                     Frame& active_frame) {
-  Frame* frame = Tree().Find(name);
-  if (!frame || !active_frame.CanNavigate(*frame))
-    return nullptr;
-  return frame;
-}
-
 static bool CanAccessAncestor(const SecurityOrigin& active_security_origin,
                               const Frame* target_frame) {
   // targetFrame can be 0 when we're trying to navigate a top-level frame
   // that has a 0 opener.
   if (!target_frame)
     return false;
 
   const bool is_local_active_origin = active_security_origin.IsLocal();
   for (const Frame* ancestor_frame = target_frame; ancestor_frame;
        ancestor_frame = ancestor_frame->Tree().Parent()) {
@@ skipping 278 matching lines @@
       is_loading_(false) {
   InstanceCounters::IncrementCounter(InstanceCounters::kFrameCounter);
 
   if (owner_)
     owner_->SetContentFrame(*this);
   else
     page_->SetMainFrame(this);
 }
 
 }  // namespace blink