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

third_party/WebKit/Source/core/loader/FrameLoaderClient.h

Index: third_party/WebKit/Source/core/loader/FrameLoaderClient.h
diff --git a/third_party/WebKit/Source/core/loader/FrameLoaderClient.h b/third_party/WebKit/Source/core/loader/FrameLoaderClient.h
index 65da964bc8d2568293971491c05be2be3aebb9b3..8b8234ee3d113695840bdfabfaca598dc53b7ea8 100644
--- a/third_party/WebKit/Source/core/loader/FrameLoaderClient.h
+++ b/third_party/WebKit/Source/core/loader/FrameLoaderClient.h
@@ -198,10 +198,14 @@ public:
     virtual bool allowPlugins(bool enabledPerSettings) { return enabledPerSettings; }
     virtual bool allowImage(bool enabledPerSettings, const KURL&) { return enabledPerSettings; }
     virtual bool allowMedia(const KURL&) { return true; }
-    virtual bool allowDisplayingInsecureContent(bool enabledPerSettings, const KURL&) { return enabledPerSettings; }
     virtual bool allowRunningInsecureContent(bool enabledPerSettings, SecurityOrigin*, const KURL&) { return enabledPerSettings; }
     virtual bool allowAutoplay(bool defaultValue) { return defaultValue; }
 
+    // Reports that passive mixed content was found at the provided URL. It may
+    // or may not be actually displayed later, what would be flagged by
+    // didDisplayInsecureContent.
+    virtual void passiveInsecureContentFound(const KURL&) {}
+
     // This callback notifies the client that the frame was about to run
     // JavaScript but did not because allowScript returned false. We
     // have a separate callback here because there are a number of places