Remove FDE support from accessibility settings

With FDE (Full Disk Encryption), secure start-up (i.e. requiring a PIN /
pattern / password to boot the device) was incompatible with
accessibility services.  Thus, the accessibility settings would ask the
user to disable secure start-up when enabling an accessibility service.

Now that FDE support has been removed in favor of FBE (File Based
Encryption), this is no longer necessary.  Remove it.

Bug: 208476087
Change-Id: I5f6e512f223df63e1b4d1c181fc8b3fe683dcd5f

src/com/android/settings/accessibility/AccessibilityServiceWarning.java

@@ -23,7 +23,6 @@ import android.app.Dialog;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.graphics.drawable.Drawable;
-import android.os.storage.StorageManager;
 import android.text.BidiFormatter;
 import android.view.LayoutInflater;
 import android.view.MotionEvent;
@@ -86,16 +85,6 @@ public class AccessibilityServiceWarning {
         return ad;
     }
 
-    /**
-     * Returns whether the device is encrypted with legacy full disk encryption. Newer devices
-     * should be using File Based Encryption.
-     *
-     * @return true if device is encrypted
-     */
-    private static boolean isFullDiskEncrypted() {
-        return StorageManager.isNonDefaultBlockEncrypted();
-    }
-
     private static View createEnableDialogContentView(Context context,
             @NonNull AccessibilityServiceInfo info, View.OnClickListener listener,
             UninstallActionPerformer performer) {
@@ -105,17 +94,6 @@ public class AccessibilityServiceWarning {
         View content = inflater.inflate(R.layout.enable_accessibility_service_dialog_content,
                 null);
 
-        TextView encryptionWarningView = (TextView) content.findViewById(
-                R.id.encryption_warning);
-        if (isFullDiskEncrypted()) {
-            String text = context.getString(R.string.enable_service_encryption_warning,
-                    getServiceName(context, info));
-            encryptionWarningView.setText(text);
-            encryptionWarningView.setVisibility(View.VISIBLE);
-        } else {
-            encryptionWarningView.setVisibility(View.GONE);
-        }
-
         final Drawable icon;
         if (info.getResolveInfo().getIconResource() == 0) {
             icon = ContextCompat.getDrawable(context, R.drawable.ic_accessibility_generic);