[Custom tab]Fix a bug that clicking media notification opens blank tab

chrome/android/java/strings/android_chrome_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!-- android_chrome_strings.grd contains strings for Chrome for Android.
 
 FAQ:
   - How do I add, change, or remove a string?
       Just update this file.
   - Translations will happen automatically??
       Yes, indeed. Just add your string before the branch point and
       make the description good.
@@ skipping 2128 matching lines @@
       </message>
       <message name="IDS_VIDEO_AUDIO_CALL_NOTIFICATION_TEXT_2" desc="Text to be shown as a notification when a WebRTC video and audio call is in progress">
         Accessing audio and video input
       </message>
       <message name="IDS_MEDIA_NOTIFICATION_LINK_TEXT" desc="Url of the current tab. The notification will display this text for the user to identify the tab to return to.">
         Touch to return to <ph name="URL_OF_THE_CURRENT_TAB">%1$s<ex>https://apprtc.appspot.com</ex></ph>
       </message>
       <message name="IDS_MEDIA_NOTIFICATION_TEXT_NO_LINK" desc="The notification will display this text for the user to identify the tab to return to when the link is unknown">
         Touch to return to the tab
       </message>
+      <message name="IDS_MEDIA_NOTIFICATION_LINK_CUSTOM_TAB" desc="The notification prompting the user to stop the media.">
+        Touch to stop <ph name="URL_OF_THE_CURRENT_TAB">%1$s<ex>https://apprtc.appspot.com</ex></ph>

[gone, 2015/09/02 21:55:17]

You're not stopping a website.  "Touch to stop playback on <site>"?

[Ian Wen, 2015/09/02 22:00:14]

Done.

+      </message>
+      <message name="IDS_MEDIA_NOTIFICATION_NO_LINK_CUSTOM_TAB" desc="The notification prompting the user to stop the media when the link is unknown.">
+        Touch to stop
+      </message>
       <message name="IDS_NEW_TAB_INCOGNITO_HEADER" desc="Header shown when a user opens an incognito tab explaining incognito mode">
         You've gone incognito.
       </message>
       <message name="IDS_NEW_TAB_INCOGNITO_MESSAGE" desc="Message shown when a user opens an incognito tab explaining incognito mode">
         Pages you view in incognito tabs won’t stick around in your browser’s history, cookie store, or search history after you’ve closed all of your incognito tabs. Any files you download or bookmarks you create will be kept.
 
 However, you aren’t invisible. Going incognito doesn’t hide your browsing from your employer, your internet service provider, or the websites you visit.
       </message>
 
       <!-- Contextual Search -->
@@ skipping 95 matching lines @@
       </message>
       <message name="IDS_HELP_CONTEXT_USAGE_REPORTS" translateable="false">
         send_crash_report
       </message>
       <message name="IDS_HELP_CONTEXT_SAD_TAB" translateable="false">
         mobile_awsnap
       </message>
     </messages>
   </release>
 </grit>