Add constant for Sync OAuth2 scope

sync/android/java/src/org/chromium/sync/notifier/SyncStatusHelper.java

Index: sync/android/java/src/org/chromium/sync/notifier/SyncStatusHelper.java
diff --git a/sync/android/java/src/org/chromium/sync/notifier/SyncStatusHelper.java b/sync/android/java/src/org/chromium/sync/notifier/SyncStatusHelper.java
index 9d82ab84962c9500859239c5d639a1c454d533d4..128bf7b50855e4a8025ba72e0a3624210f173760 100644
--- a/sync/android/java/src/org/chromium/sync/notifier/SyncStatusHelper.java
+++ b/sync/android/java/src/org/chromium/sync/notifier/SyncStatusHelper.java
@@ -86,8 +86,13 @@ public class SyncStatusHelper {
         }
     }
 
+    @Deprecated
     public static final String AUTH_TOKEN_TYPE_SYNC = "chromiumsync";
 
+    // This should always have the same value as GaiaConstants::kChromeSyncOAuth2Scope.
+    public static final String CHROME_SYNC_OAUTH2_SCOPE =
+            "https://www.googleapis.com/auth/chromesync";
+
     public static final String TAG = "SyncStatusHelper";
 
     /**