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

Source/core/fetch/ResourceFetcher.h

Index: Source/core/fetch/ResourceFetcher.h
diff --git a/Source/core/fetch/ResourceFetcher.h b/Source/core/fetch/ResourceFetcher.h
index 93626ab0a5f14d4ae66cd85191fbe7756bfb49a6..237c9c39e63679fdda5986ec6cc86d3075545a0e 100644
--- a/Source/core/fetch/ResourceFetcher.h
+++ b/Source/core/fetch/ResourceFetcher.h
@@ -31,6 +31,7 @@
 #include "core/fetch/FetchRequest.h"
 #include "core/fetch/Resource.h"
 #include "core/fetch/ResourceLoaderHost.h"
+#include "core/fetch/ResourceLoaderOptions.h"
 #include "core/fetch/ResourcePtr.h"
 #include "core/platform/Timer.h"
 #include "wtf/Deque.h"
@@ -129,6 +130,7 @@ public:
     void printPreloadStats();
     bool canRequest(Resource::Type, const KURL&, const ResourceLoaderOptions&, bool forPreload = false);
     bool canAccess(Resource*);
+    bool checkInsecureContent(Resource::Type, const KURL&, MixedContentBlockingTreatment) const;
 
     // ResourceLoaderHost
     virtual void incrementRequestCount(const Resource*) OVERRIDE;
@@ -174,7 +176,6 @@ private:
     void addAdditionalRequestHeaders(ResourceRequest&, Resource::Type);
 
     void notifyLoadedFromMemoryCache(Resource*);
-    bool checkInsecureContent(Resource::Type, const KURL&) const;
 
     void garbageCollectDocumentResourcesTimerFired(Timer<ResourceFetcher>*);
     void performPostLoadActions();