Improve clarity of Physical Web opt-in notification

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 2295 matching lines @@
 You must have Bluetooth and Location turned on in order to use the Physical Web.
       </message>
       <message name="IDS_PHYSICAL_WEB_OPTIN_TITLE" desc="The title for a dialog inviting the user to opt-in to the Physical Web.">
         Chrome + Physical Web
       </message>
       <message name="IDS_PHYSICAL_WEB_OPTIN_DESCRIPTION" desc="Description of the Physical Web displayed in the opt-in dialog">
         Chrome can now find and show you nearby web pages using Bluetooth.
 
 Chrome will scan for nearby pages when your device is unlocked. These pages will go through a Google service to improve the quality of page results.
 
-You can control Physical Web settings in Chrome privacy settings.
+You can control the Physical Web in Chrome privacy settings.
       </message>
       <message name="IDS_PHYSICAL_WEB_LIST_URLS_ACTIVITY_TITLE" desc="The title for a dialog that shows a list of URLs broadcasted from nearby devices.">
         The Physical Web
       </message>
       <message name="IDS_PHYSICAL_WEB_NOTIFICATION_TITLE" desc="The message displayed in a notification when there are nearby URLs.">
         Physical Web pages nearby
       </message>
-      <message name="IDS_PHYSICAL_WEB_OPTIN_NOTIFICATION_TITLE" desc="A notification message inviting the user to opt-in to the Physical Web.">
-        Turn on the Physical Web?
+      <message name="IDS_PHYSICAL_WEB_OPTIN_NOTIFICATION_TITLE" desc="The first line in a notification message inviting the user to opt-in to the Physical Web.">
+        Physical Web pages are nearby
+      </message>
+      <message name="IDS_PHYSICAL_WEB_OPTIN_NOTIFICATION_TEXT" desc="The second line in a notification message inviting the user to opt-in to the Physical Web.">

[newt (away), 2016/02/03 21:57:28]

I'm not sure this description give enough context for translators to understand
the string. In particular, translators probably won't understand what "them"
refers to.

[mattreynolds, 2016/02/03 22:40:55]

Done.

+        Use Chrome to browse them
       </message>
       <message name="IDS_PHYSICAL_WEB_EMPTY_LIST" desc="The message displayed in place of a list of nearby URLs when there are no URLs to display.">
         No nearby Physical Web pages found
       </message>
       <message name="IDS_PHYSICAL_WEB_EMPTY_LIST_SCANNING" desc="The message displayed in place of a list of nearby URLs while still scanning for nearby URLs.">
         Looking for nearby Physical Web pages
       </message>
       <message name="IDS_PHYSICAL_WEB_REFRESH" desc="The label for a button that initiates a scan for nearby URLs">
         Refresh
       </message>
       <message name="IDS_PHYSICAL_WEB_LAUNCH_BUTTON" desc="The label for a button that opens a list of nearby URLs">
         See what's nearby
       </message>
     </messages>
   </release>
 </grit>