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 188c8e137e2b1eb7f7c78210c2eb84d8a2b03847..9299387f5d52a78c02249d452282595528311661 100644
--- a/third_party/WebKit/Source/core/frame/Frame.cpp
+++ b/third_party/WebKit/Source/core/frame/Frame.cpp
@@ -134,14 +134,6 @@ ChromeClient& Frame::GetChromeClient() const {
   return GetEmptyChromeClient();
 }
 
-Frame* Frame::FindFrameForNavigation(const AtomicString& name,
-                                     LocalFrame& active_frame) {
-  Frame* frame = Tree().Find(name);
-  if (!frame || !active_frame.CanNavigate(*frame))
-    return nullptr;
-  return frame;
-}
-
 Frame* Frame::FindUnsafeParentScrollPropagationBoundary() {
   Frame* current_frame = this;
   Frame* ancestor_frame = Tree().Parent();