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

third_party/WebKit/Source/web/FrameLoaderClientImpl.h

 /*
  * Copyright (C) 2009, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2011 Apple 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 121 matching lines @@
     std::unique_ptr<WebMediaPlayer> createWebMediaPlayer(HTMLMediaElement&, const WebMediaPlayerSource&, WebMediaPlayerClient*) override;
     std::unique_ptr<WebMediaSession> createWebMediaSession() override;
     ObjectContentType getObjectContentType(
         const KURL&, const WTF::String& mimeType, bool shouldPreferPlugInsForImages) override;
     void didChangeScrollOffset() override;
     void didUpdateCurrentHistoryItem() override;
     bool allowScript(bool enabledPerSettings) override;
     bool allowScriptFromSource(bool enabledPerSettings, const KURL& scriptURL) override;
     bool allowPlugins(bool enabledPerSettings) override;
     bool allowImage(bool enabledPerSettings, const KURL& imageURL) override;
-    bool allowDisplayingInsecureContent(bool enabledPerSettings, const KURL&) override;
     bool allowRunningInsecureContent(bool enabledPerSettings, SecurityOrigin*, const KURL&) override;
     bool allowAutoplay(bool defaultValue) override;
+    void passiveInsecureContentFound(const KURL&) override;
     void didNotAllowScript() override;
     void didNotAllowPlugins() override;
     void didUseKeygen() override;
 
     WebCookieJar* cookieJar() const override;
     void frameFocused() const override;
     void didChangeName(const String& name, const String& uniqueName) override;
     void didEnforceInsecureRequestPolicy(WebInsecureRequestPolicy) override;
     void didUpdateToUniqueOrigin() override;
     void didChangeSandboxFlags(Frame* childFrame, SandboxFlags) override;
@@ skipping 38 matching lines @@
     Member<WebLocalFrameImpl> m_webFrame;
 
     String m_userAgent;
 };
 
 DEFINE_TYPE_CASTS(FrameLoaderClientImpl, FrameLoaderClient, client, client->isFrameLoaderClientImpl(), client.isFrameLoaderClientImpl());
 
 } // namespace blink
 
 #endif