Remove dead content sniffing code

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 462 matching lines @@
     // Any credential should have been removed from the cross-site requests.
     const KURL& requestURL = request.url();
     ASSERT(m_sameOriginRequest || requestURL.user().isEmpty());
     ASSERT(m_sameOriginRequest || requestURL.pass().isEmpty());
 
     // Update resourceLoaderOptions with enforced values.
     if (m_forceDoNotAllowStoredCredentials)
         resourceLoaderOptions.allowCredentials = DoNotAllowStoredCredentials;
     resourceLoaderOptions.securityOrigin = m_securityOrigin;
     if (m_async) {
-        if (m_actualRequest) {
-            resourceLoaderOptions.sniffContent = DoNotSniffContent;
+        if (m_actualRequest)
             resourceLoaderOptions.dataBufferingPolicy = BufferData;
-        }
 
         if (m_options.timeoutMilliseconds > 0)
             m_timeoutTimer.startOneShot(m_options.timeoutMilliseconds / 1000.0, FROM_HERE);
 
         FetchRequest newRequest(request, m_options.initiator, resourceLoaderOptions);
         if (m_options.crossOriginRequestPolicy == AllowCrossOriginRequests)
             newRequest.setOriginRestriction(FetchRequest::NoOriginRestriction);
         ASSERT(!resource());
         if (request.requestContext() == blink::WebURLRequest::RequestContextVideo || request.requestContext() == blink::WebURLRequest::RequestContextAudio)
             setResource(m_document.fetcher()->fetchMedia(newRequest));
@@ skipping 66 matching lines @@
         return DoNotAllowStoredCredentials;
     return m_resourceLoaderOptions.allowCredentials;
 }
 
 SecurityOrigin* DocumentThreadableLoader::securityOrigin() const
 {
     return m_securityOrigin ? m_securityOrigin.get() : m_document.securityOrigin();
 }
 
 } // namespace blink