Stop calling LockPatternUtils.setVisiblePasswordEnabled()

Since the removal of support for Full Disk Encryption (FDE) in favor of
File Based Encryption (FBE), this method has been a no-op.

Bug: 208476087
Test: atest ShowPasswordPreferenceControllerTest.  Note,
      isAvailable_whenNotVisible_isFalse fails both before and after.
Change-Id: Ifb8fc93757366240cf37e4b9a600c2034302919e
Merged-In: Ifb8fc93757366240cf37e4b9a600c2034302919e
(cherry picked from commit bcee8ce1af)

src/com/android/settings/security/ShowPasswordPreferenceController.java

@@ -17,25 +17,17 @@
 package com.android.settings.security;
 
 import android.content.Context;
-import android.os.UserHandle;
 import android.provider.Settings;
 
-import com.android.internal.widget.LockPatternUtils;
 import com.android.settings.R;
 import com.android.settings.core.TogglePreferenceController;
-import com.android.settings.overlay.FeatureFactory;
 
 public class ShowPasswordPreferenceController extends TogglePreferenceController {
 
     private static final String KEY_SHOW_PASSWORD = "show_password";
-    private static final int MY_USER_ID = UserHandle.myUserId();
-    private final LockPatternUtils mLockPatternUtils;
 
     public ShowPasswordPreferenceController(Context context) {
         super(context, KEY_SHOW_PASSWORD);
-        mLockPatternUtils = FeatureFactory.getFactory(context)
-                .getSecurityFeatureProvider()
-                .getLockPatternUtils(context);
     }
 
     @Override
@@ -48,7 +40,6 @@ public class ShowPasswordPreferenceController extends TogglePreferenceController
     public boolean setChecked(boolean isChecked) {
         Settings.System.putInt(mContext.getContentResolver(), Settings.System.TEXT_SHOW_PASSWORD,
                 isChecked ? 1 : 0);
-        mLockPatternUtils.setVisiblePasswordEnabled(isChecked, MY_USER_ID);
         return true;
     }