Simplify detection of new, test-related RenderFrameHosts.

content/shell/browser/layout_test/secondary_test_window_observer.cc

 // Copyright 2016 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 "content/shell/browser/layout_test/secondary_test_window_observer.h"
 
 #include "content/public/browser/render_frame_host.h"
 #include "content/shell/browser/layout_test/blink_test_controller.h"
 #include "content/shell/common/shell_messages.h"
 
@@ skipping 17 matching lines @@
 
 SecondaryTestWindowObserver::~SecondaryTestWindowObserver() {}
 
 void SecondaryTestWindowObserver::RenderFrameCreated(
     RenderFrameHost* render_frame_host) {
   DCHECK(!BlinkTestController::Get()->IsMainWindow(
       WebContents::FromRenderFrameHost(render_frame_host)));
   BlinkTestController::Get()->HandleNewRenderFrameHost(render_frame_host);
 }
 
-void SecondaryTestWindowObserver::RenderFrameHostChanged(
-    RenderFrameHost* old_host,
-    RenderFrameHost* new_host) {
-  DCHECK(!BlinkTestController::Get()->IsMainWindow(
-      WebContents::FromRenderFrameHost(new_host)));
-  BlinkTestController::Get()->HandleNewRenderFrameHost(new_host);
-}
-
 }  // namespace content