Do not treat substitute-data resources as having successful HTTP status codes.

third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.cpp

Index: third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.cpp
diff --git a/third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.cpp b/third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.cpp
index da7d65d99f6abaa313a92c605a8a13a52b99c444..bb318f7a945dfc572e9466fb3d900e7da7137ccb 100644
--- a/third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.cpp
+++ b/third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.cpp
@@ -383,8 +383,6 @@ Resource* ResourceFetcher::resourceForStaticData(
   }
 
   ResourceResponse response(url, mimetype, data->size(), charset, String());
-  response.setHTTPStatusCode(200);

[Nate Chapin, 2017/02/03 18:00:22]

This also means data: urls won't have status code. I assume that's ok?

-  response.setHTTPStatusText("OK");
 
   Resource* resource = factory.create(request.resourceRequest(),
                                       request.options(), request.charset());