[Android] Only invalidate objects that were received from Tango on resume.

chrome/android/java/src/org/chromium/chrome/browser/sync/ChromiumSyncAdapterService.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.chrome.browser.sync;
-
-import android.app.Application;
-import android.app.Service;
-import android.content.Context;
-import android.content.Intent;
-import android.os.IBinder;
-
-public abstract class ChromiumSyncAdapterService extends Service {
-    private static ChromiumSyncAdapter sSyncAdapter = null;
-    private static final Object LOCK = new Object();
-
-    /**
-     * Get the sync adapter reference, creating an instance if necessary.
-     */
-    private ChromiumSyncAdapter getOrCreateSyncAdapter(Context applicationContext) {
-        synchronized (LOCK) {
-            if (sSyncAdapter == null) {
-                sSyncAdapter = createChromiumSyncAdapter(applicationContext, getApplication());
-            }
-        }
-        return sSyncAdapter;
-    }
-
-    @Override
-    public IBinder onBind(Intent intent) {
-        return getOrCreateSyncAdapter(getApplicationContext()).getSyncAdapterBinder();
-    }
-
-    protected abstract ChromiumSyncAdapter createChromiumSyncAdapter(Context applicationContext,
-                                                                     Application application);
-}