Implement CSP check for manifest fetching

Source/core/loader/DocumentThreadableLoader.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013, Intel Corporation
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 486 matching lines @@
             newRequest.setOriginRestriction(FetchRequest::NoOriginRestriction);
         ASSERT(!resource());
         if (request.requestContext() == blink::WebURLRequest::RequestContextVideo || request.requestContext() == blink::WebURLRequest::RequestContextAudio)
             setResource(m_document.fetcher()->fetchMedia(newRequest));
         else
             setResource(m_document.fetcher()->fetchRawResource(newRequest));
         if (resource() && resource()->loader()) {
             unsigned long identifier = resource()->identifier();
             InspectorInstrumentation::documentThreadableLoaderStartedLoadingForClient(&m_document, identifier, m_client);
         }
+        if (!resource())
+            m_client->didFail(ResourceError());
         return;
     }
 
     FetchRequest fetchRequest(request, m_options.initiator, resourceLoaderOptions);
     if (m_options.crossOriginRequestPolicy == AllowCrossOriginRequests)
         fetchRequest.setOriginRestriction(FetchRequest::NoOriginRestriction);
     ResourcePtr<Resource> resource = m_document.fetcher()->fetchSynchronously(fetchRequest);
     ResourceResponse response = resource ? resource->response() : ResourceResponse();
     unsigned long identifier = resource ? resource->identifier() : std::numeric_limits<unsigned long>::max();
     ResourceError error = resource ? resource->resourceError() : ResourceError();
@@ skipping 50 matching lines @@
         return DoNotAllowStoredCredentials;
     return m_resourceLoaderOptions.allowCredentials;
 }
 
 SecurityOrigin* DocumentThreadableLoader::securityOrigin() const
 {
     return m_securityOrigin ? m_securityOrigin.get() : m_document.securityOrigin();
 }
 
 } // namespace blink