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

android_webview/native/aw_settings.cc

Index: android_webview/native/aw_settings.cc
diff --git a/android_webview/native/aw_settings.cc b/android_webview/native/aw_settings.cc
index 5f0745d0249719300dffa3875782841a9fc85894..9004dfaa32562fe73ad87e220bd883ef90e75bc9 100644
--- a/android_webview/native/aw_settings.cc
+++ b/android_webview/native/aw_settings.cc
@@ -429,10 +429,14 @@ void AwSettings::PopulateWebPreferencesLocked(JNIEnv* env,
       web_prefs->experimental_webgl_enabled &&
       enable_supported_hardware_accelerated_features;
 
-  web_prefs->allow_displaying_insecure_content =
-      Java_AwSettings_getAllowDisplayingInsecureContentLocked(env, obj);
+  // If strict mixed content checking is enabled then running should not be
+  // allowed.
+  DCHECK(!Java_AwSettings_getUseStricMixedContentCheckingLocked(env, obj) ||
+         !Java_AwSettings_getAllowRunningInsecureContentLocked(env, obj));
   web_prefs->allow_running_insecure_content =
       Java_AwSettings_getAllowRunningInsecureContentLocked(env, obj);
+  web_prefs->strict_mixed_content_checking =
+      Java_AwSettings_getUseStricMixedContentCheckingLocked(env, obj);
 
   web_prefs->fullscreen_supported =
       Java_AwSettings_getFullscreenSupportedLocked(env, obj);