Mixed Content: Re-allow non-webby URLs in IFrames.

Source/core/loader/MixedContentChecker.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 231 matching lines @@
 
     Settings* settings = frame->settings();
     FrameLoaderClient* client = frame->loader().client();
     SecurityOrigin* securityOrigin = frame->document()->securityOrigin();
     bool allowed = false;
 
     ContextType contextType = contextTypeFromContext(resourceRequest.requestContext());
     if (contextType == ContextTypeBlockableUnlessLax)
         contextType = RuntimeEnabledFeatures::laxMixedContentCheckingEnabled() ? ContextTypeOptionallyBlockable : ContextTypeBlockable;
 
+    // If we're loading the main resource of a subframe, we need to take a close look at the loaded URL.
+    // If we're dealing with a CORS-enabled scheme, then block mixed frames as active content. Otherwise,
+    // treat frames as passive content.
+    //
+    // FIXME: Remove this temporary hack once we have a reasonable API for launching external applications
+    // via URLs. http://crbug.com/318788 and https://crbug.com/393481
+    if (resourceRequest.frameType() == WebURLRequest::FrameTypeNested && !SchemeRegistry::shouldTreatURLSchemeAsCORSEnabled(url.protocol()))
+        contextType = ContextTypeOptionallyBlockable;
+
     switch (contextType) {
     case ContextTypeOptionallyBlockable:
         allowed = client->allowDisplayingInsecureContent(settings && settings->allowDisplayOfInsecureContent(), securityOrigin, url);
         if (allowed)
             client->didDisplayInsecureContent();
         break;
 
     case ContextTypeBlockable:
         allowed = client->allowRunningInsecureContent(settings && settings->allowRunningOfInsecureContent(), securityOrigin, url);
         if (allowed)
@@ skipping 144 matching lines @@
     if (Platform::current()->isReservedIPAddress(resourceIP) && !Platform::current()->isReservedIPAddress(documentIP))
         UseCounter::count(frame->document(), UseCounter::MixedContentPrivateHostnameInPublicHostname);
 }
 
 void MixedContentChecker::trace(Visitor* visitor)
 {
     visitor->trace(m_frame);
 }
 
 } // namespace blink