Remove the allow-displaying-mixed-content setting from Blink.

third_party/WebKit/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 199 matching lines @@
     // 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 (frameType == WebURLRequest::FrameTypeNested && !SchemeRegistry::shouldTreatURLSchemeAsCORSEnabled(url.protocol()))
         contextType = WebMixedContent::ContextType::OptionallyBlockable;
 
     switch (contextType) {
     case WebMixedContent::ContextType::OptionallyBlockable:
-        allowed = !strictMode && client->allowDisplayingInsecureContent(settings && settings->allowDisplayOfInsecureContent(), url);
+        client->passiveInsecureContentFound(url);
+        allowed = !strictMode;
         if (allowed)
             client->didDisplayInsecureContent();
         break;
 
     case WebMixedContent::ContextType::Blockable: {
         // Strictly block subresources that are mixed with respect to
         // their subframes, unless all insecure content is allowed. This
         // is to avoid the following situation: https://a.com embeds
         // https://b.com, which loads a script over insecure HTTP. The
         // user opts to allow the insecure content, thinking that they are
@@ skipping 162 matching lines @@
     // See comment in shouldBlockFetch() about loading the main resource of a subframe.
     if (request.frameType() == WebURLRequest::FrameTypeNested && !SchemeRegistry::shouldTreatURLSchemeAsCORSEnabled(request.url().protocol())) {
         return WebMixedContent::ContextType::OptionallyBlockable;
     }
 
     bool strictMixedContentCheckingForPlugin = mixedFrame->settings() && mixedFrame->settings()->strictMixedContentCheckingForPlugin();
     return WebMixedContent::contextTypeFromRequestContext(request.requestContext(), strictMixedContentCheckingForPlugin);
 }
 
 } // namespace blink