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

components/test_runner/mock_content_settings_client.cc

 // Copyright 2014 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 "components/test_runner/mock_content_settings_client.h"
 
 #include "components/test_runner/layout_test_runtime_flags.h"
 #include "components/test_runner/test_common.h"
 #include "components/test_runner/web_test_delegate.h"
 #include "third_party/WebKit/public/platform/WebURL.h"
@@ skipping 36 matching lines @@
 }
 
 bool MockContentSettingsClient::allowStorage(bool enabled_per_settings) {
   return flags_->storage_allowed();
 }
 
 bool MockContentSettingsClient::allowPlugins(bool enabled_per_settings) {
   return enabled_per_settings && flags_->plugins_allowed();
 }
 
-bool MockContentSettingsClient::allowDisplayingInsecureContent(
-    bool enabled_per_settings,
-    const blink::WebURL& url) {
-  return enabled_per_settings || flags_->displaying_insecure_content_allowed();
-}
-
 bool MockContentSettingsClient::allowRunningInsecureContent(
     bool enabled_per_settings,
     const blink::WebSecurityOrigin& context,
     const blink::WebURL& url) {
   return enabled_per_settings || flags_->running_insecure_content_allowed();
 }
 
 bool MockContentSettingsClient::allowAutoplay(bool default_value) {
   return default_value || flags_->autoplay_allowed();
 }
 
 void MockContentSettingsClient::SetDelegate(WebTestDelegate* delegate) {
   delegate_ = delegate;
 }
 
 }  // namespace test_runner