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

chrome/common/pref_names.cc

 // 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.
 
 #include "chrome/common/pref_names.h"
 
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "chrome/common/pref_font_webkit_names.h"
 
@@ skipping 305 matching lines @@
     "webkit.webprefs.fonts.sansserif.Hant";
 
 // WebKit preferences.
 const char kWebKitWebSecurityEnabled[] = "webkit.webprefs.web_security_enabled";
 const char kWebKitDomPasteEnabled[] = "webkit.webprefs.dom_paste_enabled";
 const char kWebKitUsesUniversalDetector[] =
     "webkit.webprefs.uses_universal_detector";
 const char kWebKitTextAreasAreResizable[] =
     "webkit.webprefs.text_areas_are_resizable";
 const char kWebkitTabsToLinks[] = "webkit.webprefs.tabs_to_links";
-const char kWebKitAllowDisplayingInsecureContent[] =
-    "webkit.webprefs.allow_displaying_insecure_content";
 const char kWebKitAllowRunningInsecureContent[] =
     "webkit.webprefs.allow_running_insecure_content";
 #if defined(OS_ANDROID)
 const char kWebKitFontScaleFactor[] = "webkit.webprefs.font_scale_factor";
 const char kWebKitForceEnableZoom[] = "webkit.webprefs.force_enable_zoom";
 const char kWebKitPasswordEchoEnabled[] =
     "webkit.webprefs.password_echo_enabled";
 #endif
 
 const char kWebKitCommonScript[] = "Zyyy";
@@ skipping 1916 matching lines @@
 const char kOriginTrialPublicKey[] = "origin_trials.public_key";
 
 // A list of origin trial features to disable by policy.
 const char kOriginTrialDisabledFeatures[] = "origin_trials.disabled_features";
 
 // Policy that indicates the state of updates for the binary components.
 const char kComponentUpdatesEnabled[] =
     "component_updates.component_updates_enabled";
 
 }  // namespace prefs