Consider "mixed content XHR" as mixed script instead of mixed display.

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 17 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/loader/DocumentThreadableLoader.h"
 
 #include "core/dom/Document.h"
 #include "core/fetch/FetchRequest.h"
 #include "core/fetch/RawResource.h"
+#include "core/fetch/Resource.h"
 #include "core/fetch/ResourceFetcher.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/loader/CrossOriginAccessControl.h"
 #include "core/loader/CrossOriginPreflightResultCache.h"
 #include "core/loader/DocumentThreadableLoaderClient.h"
 #include "core/loader/FrameLoader.h"
 #include "core/loader/ThreadableLoaderClient.h"
 #include "core/page/ContentSecurityPolicy.h"
 #include "core/page/Frame.h"
 #include "core/platform/network/ResourceError.h"
@@ skipping 357 matching lines @@
 }
 
 void DocumentThreadableLoader::loadRequest(const ResourceRequest& request, SecurityCheckPolicy securityCheck)
 {
     // Any credential should have been removed from the cross-site requests.
     const KURL& requestURL = request.url();
     m_options.securityCheck = securityCheck;
     ASSERT(m_sameOriginRequest || requestURL.user().isEmpty());
     ASSERT(m_sameOriginRequest || requestURL.pass().isEmpty());
 
+    ThreadableLoaderOptions options = m_options;
     if (m_async) {
-        ThreadableLoaderOptions options = m_options;
         options.crossOriginCredentialPolicy = DoNotAskClientForCrossOriginCredentials;
         if (m_actualRequest) {
             // Don't sniff content or send load callbacks for the preflight request.
             options.sendLoadCallbacks = DoNotSendCallbacks;
             options.sniffContent = DoNotSniffContent;
             // Keep buffering the data for the preflight request.
             options.dataBufferingPolicy = BufferData;
         }
 
         if (m_options.timeoutMilliseconds > 0)
@@ skipping 11 matching lines @@
         }
         return;
     }
 
     // FIXME: ThreadableLoaderOptions.sniffContent is not supported for synchronous requests.
     Vector<char> data;
     ResourceError error;
     ResourceResponse response;
     unsigned long identifier = std::numeric_limits<unsigned long>::max();
     if (Frame* frame = m_document->frame()) {
-        Frame* top = frame->tree()->top();
-        if (!top->loader()->mixedContentChecker()->canDisplayInsecureContent(top->document()->securityOrigin(), requestURL)) {
+        if (!m_document->fetcher()->checkInsecureContent(Resource::Raw, requestURL, options.mixedContentBlockingTreatment)) {
             m_client->didFail(error);
             return;
         }
         identifier = frame->loader()->loadResourceSynchronously(request, m_options.allowCredentials, error, response, data);
     }
 
     InspectorInstrumentation::documentThreadableLoaderStartedLoadingForClient(m_document, identifier, m_client);
 
     // No exception for file:/// resources, see <rdar://problem/4962298>.
     // Also, if we have an HTTP response, then it wasn't a network error in fact.
@@ skipping 48 matching lines @@
 
     if (!(requestUrl.user().isEmpty() && requestUrl.pass().isEmpty())) {
         errorDescription = "The request was redirected to a URL ('" + requestUrl.string() + "') containing userinfo, which is disallowed for cross-origin requests.";
         return false;
     }
 
     return true;
 }
 
 } // namespace WebCore