Use ICU plural syntax in more place

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 612 matching lines @@
       <message name="IDS_PROMPT_MALICIOUS_DOWNLOAD_URL"
          desc="Message shown to the user to validate the download when the download url is classified to lead to malware by the safebrowsing database.">
         This file is malicious, and Chromium has blocked it.
       </message>
       <message name="IDS_PROMPT_MALICIOUS_DOWNLOAD_CONTENT"
          desc="Message shown to the user to validate the download when the download content is classified to lead to malware by safebrowsing.">
         <ph name="FILE_NAME">$1<ex>malware.exe</ex></ph> is malicious, and Chromium has blocked it.
       </message>
 
       <!-- Remove in-progress downloads confirmation dialog -->
-      <message name="IDS_SINGLE_DOWNLOAD_REMOVE_CONFIRM_EXPLANATION" desc="Explanation of the dialog asking for user confirmation to close the browser when one download is in progress.">
-        A download is currently in progress. Do you want to exit Chromium and cancel the download?
-      </message>
-      <message name="IDS_MULTIPLE_DOWNLOADS_REMOVE_CONFIRM_EXPLANATION" desc="Explanation of the dialog asking for user confirmation to close the browser when multiple downloads are in progress.">
-        Downloads are currently in progress. Do you want to exit Chromium and cancel the downloads?
-      </message>
-      <message name="IDS_DOWNLOAD_REMOVE_CONFIRM_OK_BUTTON_LABEL" desc="Button text for OKing to close the browser when one or more downloads are in progress.">
-        Yes, exit Chromium
+      <message name="IDS_DOWNLOAD_REMOVE_CONFIRM_EXPLANATION" desc="Explanation of the dialog asking for user confirmation to close the browser when one or more downloads are in progress. [ICU Syntax]">
+      {NUM_DOWNLOAD, plural,
+        =1 {A download is currently in progress. Do you want to cancel the download and exit Chromium?}
+        other {# downloads are currently in progress. Do you want to cancel the downloads and exit Chromium?}}
       </message>
 
       <!-- Quit all apps confirmation dialog -->
       <if expr="is_macosx">
         <message name="IDS_QUIT_WITH_APPS_TITLE" desc="Title for a notification explaining that Chrome is running in the background.">
           Chromium is in background mode.
         </message>
       </if>
 
       <!-- Autolaunch infobar -->
@@ skipping 693 matching lines @@
           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>