🎾 Migrate more shared preferences to ContextUtils.

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

Index: sync/android/java/src/org/chromium/sync/signin/ChromeSigninController.java
diff --git a/sync/android/java/src/org/chromium/sync/signin/ChromeSigninController.java b/sync/android/java/src/org/chromium/sync/signin/ChromeSigninController.java
index 26a5067d184150cb1bd2b7e6269d9059f34d8530..e37cf1e0cb89da46029185c2a5f7216b67970a62 100644
--- a/sync/android/java/src/org/chromium/sync/signin/ChromeSigninController.java
+++ b/sync/android/java/src/org/chromium/sync/signin/ChromeSigninController.java
@@ -6,8 +6,8 @@ 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;
 
 /**
@@ -59,7 +59,7 @@ public class ChromeSigninController {
     }
 
     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.
@@ -67,7 +67,6 @@ public class ChromeSigninController {
     }
 
     public String getSignedInAccountName() {
-        return PreferenceManager.getDefaultSharedPreferences(mApplicationContext)
-                .getString(SIGNED_IN_ACCOUNT_KEY, null);
+        return ContextUtils.getAppSharedPreferences().getString(SIGNED_IN_ACCOUNT_KEY, null);
     }
 }