Simplify detection of new, test-related RenderFrameHosts.

content/shell/browser/layout_test/secondary_test_window_observer.cc

Index: content/shell/browser/layout_test/secondary_test_window_observer.cc
diff --git a/content/shell/browser/layout_test/secondary_test_window_observer.cc b/content/shell/browser/layout_test/secondary_test_window_observer.cc
index f1c204f5d5393f3db670a96e0cdc32591d541f5e..726fc188d4ed6c774799ed279362d2c96054483a 100644
--- a/content/shell/browser/layout_test/secondary_test_window_observer.cc
+++ b/content/shell/browser/layout_test/secondary_test_window_observer.cc
@@ -35,12 +35,4 @@ void SecondaryTestWindowObserver::RenderFrameCreated(
   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