Use GoogleAuthUtil's getToken instead of AccountManager

chrome/android/sync_shell/javatests/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2015 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 name must be unique. -->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="org.chromium.chrome.sync_shell.tests">
     <uses-sdk android:minSdkVersion="16" android:targetSdkVersion="22" />
     <uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
     <uses-permission android:name="android.permission.READ_LOGS"/>
     <uses-permission android:name="android.permission.WAKE_LOCK" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
     <uses-permission android:name="android.permission.INTERNET" />
 
     <application
         android:label="ChromeSyncShellTest">
-
         <uses-library android:name="android.test.runner" />
-
-        <activity android:name="org.chromium.sync.test.util.MockGrantCredentialsPermissionActivity"
-            android:exported="true">
-            <intent-filter>
-                <action android:name="android.intent.action.VIEW" />
-                <category android:name="android.intent.category.DEFAULT" />
-            </intent-filter>
-        </activity>
     </application>
     <instrumentation android:name="org.chromium.chrome.test.ChromeInstrumentationTestRunner"
         android:targetPackage="{{manifest_package}}"
         android:label="Tests for {{manifest_package}}"/>
 </manifest>