[Sync] PassphraseActivity: unregister for sync events when paused.

chrome/android/shell/java/AndroidManifest.xml.jinja2

 <?xml version="1.0" encoding="utf-8"?>
 
 <!-- Copyright 2014 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.chrome.shell">
@@ skipping 47 matching lines @@
                 <action android:name="android.intent.action.VIEW" />
                 <category android:name="android.intent.category.DEFAULT" />
             </intent-filter>
         </activity>
         <activity android:theme="@style/PreferencesTheme"
                 android:name="org.chromium.chrome.shell.preferences.ChromeShellPreferences"
                 android:configChanges="orientation|keyboardHidden|keyboard|screenSize"
                 android:label="@string/preferences"
                 android:exported="false">
         </activity>
+        <activity android:name="org.chromium.chrome.browser.sync.ui.PassphraseActivity"
+                  android:theme="@style/PreferencesTheme">
+        </activity>
 
         <!-- The following service entries exist in order to allow us to
              start more than one sandboxed process. -->
 
         <!-- NOTE: If you change the value of "android:process" for the below services,
              you also need to update kHelperProcessExecutableName in chrome_constants.cc. -->
         {% set num_sandboxed_services = 20 %}
         <meta-data android:name="org.chromium.content.browser.NUM_SANDBOXED_SERVICES"
                    android:value="{{ num_sandboxed_services }}"/>
         {% for i in range(num_sandboxed_services) %}
@@ skipping 143 matching lines @@
         <!-- Media route controllers to use for remote playback (cast).
              This is here, rather than in code, since it varies between upstream and downstream,
              yet we need this list of classes in the notification service, which belongs upstream
              and doesn't run the downstream Clank startup code. The Cast code will, for each media element,
              choose the first MediaRouteController that can play it, so the order of the list can be important.
              The most specific MediaRouteControllers should be listed first, followed by more generic ones -->
         <meta-data android:name="org.chromium.content.browser.REMOTE_MEDIA_PLAYERS"
             android:value="org.chromium.chrome.browser.media.remote.DefaultMediaRouteController"/>
     </application>
 </manifest>