Update network error template to new design

chrome/app/chromium_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <!-- This file contains definitions of strings that are distribution specific.
 These strings will not be translated and only english versions will
 be available for now. -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/chromium_strings.h" type="rc_header">
       <emit emit_type='prepend'></emit>
@@ skipping 1244 matching lines @@
         </message>
         <message name="IDS_SSL_CLOCK_ERROR_EXPLANATION" desc="Body text for the explanation shown for when the computer's clock is wrong.">
         To establish a secure network connection, your computer needs a correct clock. This is because the certificates websites use to identify themselves when establishing a secure connection are only valid for a specific time period. Since your computer's clock is wrong, Chromium cannot properly check certificates.
         </message>
       </if>
 
       <message name="IDS_SSL_NONOVERRIDABLE_MORE_INVALID_SP3" desc="Body text for the explanation shown if the user clicks on the details windows, the certificate is invalid and the user has an old version of Windows (before WINDOWS XP SP3) running.">
       Your computer is running an old version of Microsoft Windows that cannot process this website's security certificate. Because of this problem, Chromium can't tell whether the certificate came from <ph name="SITE">$1<ex>google.com</ex></ph> or from someone on your network pretending to be <ph name="SITE">$1<ex>google.com</ex></ph>. Please update your computer to a more recent version of Windows.
       </message>
 
+      <!-- Offline interstitial  -->
+      <if expr="not is_android and not is_ios">
+        <message name="IDS_ERRORPAGES_SUMMARY_INTERNET_DISCONNECTED" desc="Summary of the error page when the network connection failed. May be followed by platform dependent instructions.">
+        Chromium can’t display the webpage because your computer isn’t connected to the Internet.
+        </message>
+      </if>
+
       <!-- OOBE -->
       <if expr="chromeos">
         <message name="IDS_INSTALLING_UPDATE" desc="Label shown on the updates installation screen during OOBE">
           Please wait while Chromium installs the latest system updates.
         </message>
         <message name="IDS_CHECKING_FOR_UPDATE_MSG" desc="Chrome OS OOBE: message shown during checking for update stage.">
           Chromium updates automatically so you always have the freshest version.
         </message>
         <message name="IDS_UPDATE_MSG" desc="Chrome OS OOBE: message shown during update stage.">
           Chromium updates automatically so you always have the freshest version. When this download completes, Chromium will restart and you'll be on your way.
         </message>
         <message name="IDS_EULA_SCREEN_ACCESSIBLE_TITLE" desc="Title to be spoken on opening the OOBE EULA screen">
           Chromium OS terms
         </message>
       </if>
 
     </messages>
   </release>
 </grit>