FrameTree::Find only searches relative to local frames.

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

Index: third_party/WebKit/Source/core/frame/Frame.cpp
diff --git a/third_party/WebKit/Source/core/frame/Frame.cpp b/third_party/WebKit/Source/core/frame/Frame.cpp
index 28a96d4a9feb27d840f133551d8a334524fcce92..8231f58b32d80161bbc1aec09c31a4604a1e3ea8 100644
--- a/third_party/WebKit/Source/core/frame/Frame.cpp
+++ b/third_party/WebKit/Source/core/frame/Frame.cpp
@@ -131,14 +131,6 @@ ChromeClient& Frame::GetChromeClient() const {
   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