FrameTree::Find only searches relative to local frames.

content/renderer/render_view_browsertest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stddef.h>
 #include <stdint.h>
 #include <tuple>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 1700 matching lines @@
   common_params.url = GURL("data:text/html,world");
   common_params.navigation_type = FrameMsg_Navigate_Type::DIFFERENT_DOCUMENT;
   common_params.transition = ui::PAGE_TRANSITION_TYPED;
   common_params.navigation_start = base::TimeTicks::FromInternalValue(1);
   request_params.current_history_list_length = 1;
   request_params.current_history_list_offset = 0;
   request_params.pending_history_list_offset = 1;
 
   TestRenderFrame* subframe =
       static_cast<TestRenderFrame*>(RenderFrameImpl::FromWebFrame(
-          view()->webview()->FindFrameByName("frame")));
+          frame()->GetWebFrame()->FindFrameByName("frame")));
   subframe->Navigate(common_params, StartNavigationParams(), request_params);
   FrameLoadWaiter(subframe).Wait();
 
   // Copy the document content to std::wstring and compare with the
   // expected result.
   const int kMaxOutputCharacters = 256;
   std::string output = WebFrameContentDumper::DumpWebViewAsText(
                            view()->GetWebView(), kMaxOutputCharacters)
                            .Utf8();
   EXPECT_EQ(output, "hello  \n\nworld");
@@ skipping 859 matching lines @@
   ExpectPauseAndResume(3);
   blink::WebScriptSource source2(
       WebString::FromUTF8("function func2() { func1(); }; func2();"));
   frame()->GetWebFrame()->ExecuteScriptInIsolatedWorld(17, &source2, 1);
 
   EXPECT_FALSE(IsPaused());
   Detach();
 }
 
 }  // namespace content