Do not reinvent the wheel / use content APIs to find a frame by name.

chrome/browser/autofill/autofill_interactive_uitest.cc

 // Copyright (c) 2013 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 <string>
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
@@ skipping 197 matching lines @@
   bool waiting_for_text_change_;
 
   DISALLOW_COPY_AND_ASSIGN(AutofillManagerTestDelegateImpl);
 };
 
 // Searches all frames of |web_contents| and returns one called |name|. If
 // there are none, returns null, if there are more, returns an arbitrary one.
 content::RenderFrameHost* RenderFrameHostForName(
     content::WebContents* web_contents,
     const std::string& name) {
-  for (content::RenderFrameHost* frame : web_contents->GetAllFrames()) {
-    if (frame->GetFrameName() == name)
-      return frame;
-  }
-  return nullptr;
+  return content::FrameMatchingPredicate(
+      web_contents, base::Bind(&content::FrameMatchesName, name));
 }
 
 }  // namespace
 
 // AutofillInteractiveTest ----------------------------------------------------
 
 class AutofillInteractiveTest : public InProcessBrowserTest {
  protected:
   AutofillInteractiveTest() :
       key_press_event_sink_(
@@ skipping 1627 matching lines @@
   std::string script_focus(
       "window.focus();"
       "document.getElementById('CREDIT_CARD_NUMBER').focus();");
   ASSERT_TRUE(content::ExecuteScript(cross_frame, script_focus));
 
   // Send an arrow dow keypress in order to trigger the autofill popup.
   SendKeyToPageAndWait(ui::DomKey::ARROW_DOWN);
 }
 
 }  // namespace autofill