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

android_webview/renderer/aw_content_settings_client.cc

Index: android_webview/renderer/aw_content_settings_client.cc
diff --git a/android_webview/renderer/aw_content_settings_client.cc b/android_webview/renderer/aw_content_settings_client.cc
index a5e4d5e82864cc71e24ba09df15c52e555c98d18..a51b3acd9e2168e182529f6472158dd2078ef8eb 100644
--- a/android_webview/renderer/aw_content_settings_client.cc
+++ b/android_webview/renderer/aw_content_settings_client.cc
@@ -33,12 +33,6 @@ AwContentSettingsClient::AwContentSettingsClient(
 AwContentSettingsClient::~AwContentSettingsClient() {
 }
 
-bool AwContentSettingsClient::allowDisplayingInsecureContent(
-      bool enabled_per_settings,
-      const blink::WebURL& url) {
-  return enabled_per_settings ? true : AllowMixedContent(url);
-}
-
 bool AwContentSettingsClient::allowRunningInsecureContent(
       bool enabled_per_settings,
       const blink::WebSecurityOrigin& origin,