Get OAuth2TokenService working on Android.

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

 // Copyright (c) 2011 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 com.google.common.annotations.VisibleForTesting;
 
 import android.accounts.Account;
@@ skipping 288 matching lines @@
     public void getNewAuthTokenFromForeground(Account account, String authToken,
                 String authTokenType, GetAuthTokenCallback callback) {
         if (authToken != null && !authToken.isEmpty()) {
             mAccountManager.invalidateAuthToken(GOOGLE_ACCOUNT_TYPE, authToken);
         }
         AtomicInteger numTries = new AtomicInteger(0);
         AtomicBoolean errorEncountered = new AtomicBoolean(false);
         getAuthTokenAsynchronously(
             null, account, authTokenType, callback, numTries, errorEncountered, null);
     }
+
+    /**
+     * Removes an auth token from the AccountManager's cache.
+     */
+    public void invalidateAuthToken(String accountType, String authToken) {
+        mAccountManager.invalidateAuthToken(accountType, authToken);
+    }
 }