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

android_webview/java/src/org/chromium/android_webview/AwSettings.java

Index: android_webview/java/src/org/chromium/android_webview/AwSettings.java
diff --git a/android_webview/java/src/org/chromium/android_webview/AwSettings.java b/android_webview/java/src/org/chromium/android_webview/AwSettings.java
index ea93c487e7361672424d75e3a878d6b2ebc4c5c2..aaab5b6f3efd531668204afe9840f4cde9aa1757 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwSettings.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwSettings.java
@@ -1637,10 +1637,9 @@ public class AwSettings {
     }
 
     @CalledByNative
-    private boolean getAllowDisplayingInsecureContentLocked() {
+    private boolean getUseStricMixedContentCheckingLocked() {
         assert Thread.holdsLock(mAwSettingsLock);
-        return mMixedContentMode == WebSettings.MIXED_CONTENT_ALWAYS_ALLOW
-                || mMixedContentMode == WebSettings.MIXED_CONTENT_COMPATIBILITY_MODE;
+        return mMixedContentMode == WebSettings.MIXED_CONTENT_NEVER_ALLOW;
     }
 
     public boolean getOffscreenPreRaster() {