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

chrome/renderer/content_settings_observer.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_RENDERER_CONTENT_SETTINGS_OBSERVER_H_
 #define CHROME_RENDERER_CONTENT_SETTINGS_OBSERVER_H_
 
 #include <map>
 #include <set>
 
@@ skipping 60 matching lines @@
   bool allowScript(bool enabled_per_settings) override;
   bool allowScriptFromSource(bool enabled_per_settings,
                              const blink::WebURL& script_url) override;
   bool allowStorage(bool local) override;
   bool allowReadFromClipboard(bool default_value) override;
   bool allowWriteToClipboard(bool default_value) override;
   bool allowMutationEvents(bool default_value) override;
   void didNotAllowPlugins() override;
   void didNotAllowScript() override;
   void didUseKeygen() override;
-  bool allowDisplayingInsecureContent(bool allowed_per_settings,
-                                      const blink::WebURL& url) override;
   bool allowRunningInsecureContent(bool allowed_per_settings,
                                    const blink::WebSecurityOrigin& context,
                                    const blink::WebURL& url) override;
   bool allowAutoplay(bool default_value) override;
+  void passiveInsecureContentFound(const blink::WebURL&) override;
 
  private:
   FRIEND_TEST_ALL_PREFIXES(ContentSettingsObserverTest, WhitelistedSchemes);
   FRIEND_TEST_ALL_PREFIXES(ChromeRenderViewTest,
                            ContentSettingsInterstitialPages);
   FRIEND_TEST_ALL_PREFIXES(ChromeRenderViewTest, PluginsTemporarilyAllowed);
 
   // RenderFrameObserver implementation.
   bool OnMessageReceived(const IPC::Message& message) override;
   void DidCommitProvisionalLoad(bool is_new_navigation,
@@ skipping 27 matching lines @@
   static bool IsWhitelistedForContentSettings(
       const blink::WebSecurityOrigin& origin,
       const GURL& document_url);
 
 #if defined(ENABLE_EXTENSIONS)
   // Owned by ChromeContentRendererClient and outlive us.
   extensions::Dispatcher* extension_dispatcher_;
 #endif
 
   // Insecure content may be permitted for the duration of this render view.
-  bool allow_displaying_insecure_content_;
   bool allow_running_insecure_content_;
 
   // A pointer to content setting rules stored by the renderer. Normally, the
   // |RendererContentSettingRules| object is owned by
   // |ChromeRenderThreadObserver|. In the tests it is owned by the caller of
   // |SetContentSettingRules|.
   const RendererContentSettingRules* content_setting_rules_;
 
   // Stores if images, scripts, and plugins have actually been blocked.
   std::map<ContentSettingsType, bool> content_blocked_;
@@ skipping 12 matching lines @@
   typedef std::map<int, blink::WebContentSettingCallbacks> PermissionRequestMap;
   PermissionRequestMap permission_requests_;
 
   // If true, IsWhitelistedForContentSettings will always return true.
   const bool should_whitelist_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentSettingsObserver);
 };
 
 #endif  // CHROME_RENDERER_CONTENT_SETTINGS_OBSERVER_H_