Test that no crash happens with the CWS error page.

content/browser/frame_host/navigation_request.cc

Index: content/browser/frame_host/navigation_request.cc
diff --git a/content/browser/frame_host/navigation_request.cc b/content/browser/frame_host/navigation_request.cc
index a5a193160646054bdf9751aaf94b7c100b7092ed..d7b171d58b8c52ce075fa819fc05250f4b90bb9a 100644
--- a/content/browser/frame_host/navigation_request.cc
+++ b/content/browser/frame_host/navigation_request.cc
@@ -615,7 +615,12 @@ void NavigationRequest::OnRequestFailed(bool has_stale_copy_in_cache,
 
   // Don't ask the renderer to commit an URL if the browser will kill it when
   // it does.
-  DCHECK(render_frame_host->CanCommitURL(common_params_.url));
+  if (!render_frame_host->CanCommitURL(common_params_.url)) {
+    // TODO(arthursonzogni, alexmos): This code should be replaced by
+    // UNREACHED() once the error pages are refactored.
+    // See crbug.com/588314 and crbug.com/622385.
+    common_params_.url = GURL(kUnreachableWebDataURL);

[nasko, 2017/03/22 17:35:22]

This is not something we should do. Charlie, Alex and I discussed what the right
thing for error pages to is, but it is not a simple fix, rather a project on its
own.

+  }
 
   NavigatorImpl::CheckWebUIRendererDoesNotDisplayNormalURL(render_frame_host,
                                                            common_params_.url);