Refactor ActivityStatus to not store current activity

chrome/android/java/src/org/chromium/chrome/browser/sync/DelayedSyncController.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.accounts.Account;
 import android.content.ContentResolver;
 import android.content.Context;
 import android.content.SharedPreferences;
@@ skipping 75 matching lines @@
      */
     @VisibleForTesting
     void clearDelayedSyncs(Context context) {
         setDelayedSync(context, null);
     }
 
     @VisibleForTesting
     boolean shouldPerformSync(Context ctx, Bundle extras, Account account) {
         boolean manualSync = isManualSync(extras);
 
-        if (manualSync || ActivityStatus.isApplicationVisible()) {
+        if (manualSync || ActivityStatus.hasVisibleActivities()) {
             clearDelayedSyncs(ctx);
             return true;
         } else {
             Log.d(TAG, "Delaying sync.");
             setDelayedSync(ctx, account.name);
             return false;
         }
     }
 
     private static boolean isManualSync(Bundle extras) {
         boolean manualSync = false;
         if (extras.getBoolean(ContentResolver.SYNC_EXTRAS_MANUAL, false)) {
             manualSync = true;
             Log.d(TAG, "Manual sync requested.");
         }
         return manualSync;
     }
 }