Add Dart MIME type to mimeTypeAllowedByNosniff

Source/core/fetch/ScriptResource.cpp

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
     Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
     Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
@@ skipping 79 matching lines @@
         // but we can't destroy script in destroyDecodedData because that's our only copy of the data!
         setEncodedSize(script.sizeInBytes());
         m_script = AtomicString(script);
     }
 
     return m_script.string();
 }
 
 bool ScriptResource::mimeTypeAllowedByNosniff() const
 {
-    return parseContentTypeOptionsHeader(m_response.httpHeaderField("X-Content-Type-Options")) != ContentTypeOptionsNosniff || MIMETypeRegistry::isSupportedJavaScriptMIMEType(mimeType());
+    // FIXMEDART: Added for Dart MIME type support.
+    return parseContentTypeOptionsHeader(m_response.httpHeaderField("X-Content-Type-Options")) != ContentTypeOptionsNosniff
+        || MIMETypeRegistry::isSupportedJavaScriptMIMEType(mimeType())
+        || MIMETypeRegistry::isSupportedDartMIMEType(mimeType());
 }
 
 } // namespace blink