Revert 177385 "Block mixed <picture> and <img srcset> by default."

trunk/Source/core/loader/ImageLoader.cpp

Index: trunk/Source/core/loader/ImageLoader.cpp
===================================================================
--- trunk/Source/core/loader/ImageLoader.cpp	(revision 177411)
+++ trunk/Source/core/loader/ImageLoader.cpp	(working copy)
@@ -183,11 +183,7 @@
     KURL url = imageURL();
     ResourcePtr<ImageResource> newImage = 0;
     if (!url.isNull()) {
-        // Unlike raw <img>, we block mixed content inside of <picture> or <img srcset>.
-        ResourceLoaderOptions resourceLoaderOptions;
-        if (isHTMLPictureElement(element()->parentNode()) || !element()->fastGetAttribute(HTMLNames::srcsetAttr).isEmpty())
-            resourceLoaderOptions.mixedContentBlockingTreatment = TreatAsActiveContent;
-        FetchRequest request(ResourceRequest(url), element()->localName(), resourceLoaderOptions);
+        FetchRequest request(ResourceRequest(url), element()->localName());
         if (bypassMainWorldCSP)
             request.setContentSecurityCheck(DoNotCheckContentSecurityPolicy);