[Background Sync] Use GcmNetworkManager to start the browser for sync events.

content/shell/android/shell_apk/AndroidManifest.xml.jinja2

 <?xml version="1.0" encoding="utf-8"?>
 
 <!-- Copyright (c) 2012 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.
  -->
 
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="org.chromium.content_shell_apk">
@@ skipping 43 matching lines @@
                    android:value="{{ num_privileged_services }}"/>
         {% for i in range(num_privileged_services) %}
         <service android:name="org.chromium.content.app.PrivilegedProcessService{{ i }}"
                  android:process=":privileged_process{{ i }}"
                  android:isolatedProcess="false"
                  android:exported="false" />
         {% endfor %}
         <meta-data android:name="org.chromium.content.browser.SMART_CLIP_PROVIDER"
                    android:value="org.chromium.content.browser.SmartClipProvider" />
 
-        <!-- Service Worker Background Sync service listener -->
-        <service android:name="org.chromium.content.browser.BackgroundSyncLauncherService"
-            android:exported="false" />
-        <receiver android:name="org.chromium.content.browser.BackgroundSyncLauncherService$Receiver">
-            <intent-filter>
-                <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
-            </intent-filter>
-        </receiver>
-
     </application>
 </manifest>