🎾 Migrate more shared preferences to ContextUtils.

sync/android/java/src/org/chromium/sync/signin/ChromeSigninController.java

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.sync.signin;
 
 import android.accounts.Account;
 import android.content.Context;
-import android.preference.PreferenceManager;
 
+import org.chromium.base.ContextUtils;
 import org.chromium.sync.AndroidSyncSettings;
 
 /**
  * Caches the signed-in username in the app prefs.
  */
 public class ChromeSigninController {
 
     public static final String TAG = "ChromeSigninController";
 
     // Used by ChromeBackupAgent and for testing.
@@ skipping 31 matching lines @@
             return null;
         }
         return AccountManagerHelper.createAccountFromName(syncAccountName);
     }
 
     public boolean isSignedIn() {
         return getSignedInAccountName() != null;
     }
 
     public void setSignedInAccountName(String accountName) {
-        PreferenceManager.getDefaultSharedPreferences(mApplicationContext).edit()
+        ContextUtils.getAppSharedPreferences().edit()
                 .putString(SIGNED_IN_ACCOUNT_KEY, accountName)
                 .apply();
         // TODO(maxbogue): Move this to SigninManager.
         AndroidSyncSettings.updateAccount(mApplicationContext, getSignedInUser());
     }
 
     public String getSignedInAccountName() {
-        return PreferenceManager.getDefaultSharedPreferences(mApplicationContext)
-                .getString(SIGNED_IN_ACCOUNT_KEY, null);
+        return ContextUtils.getAppSharedPreferences().getString(SIGNED_IN_ACCOUNT_KEY, null);
     }
 }