Use ICU plural syntax in more place

chrome/app/chromium_strings.grd

Index: chrome/app/chromium_strings.grd
diff --git a/chrome/app/chromium_strings.grd b/chrome/app/chromium_strings.grd
index 01501d6c1867c0f47fc1f4ce80d2fe7630216216..40d21b233c34650038eb6af2778500f8b6ecc709 100644
--- a/chrome/app/chromium_strings.grd
+++ b/chrome/app/chromium_strings.grd
@@ -630,14 +630,10 @@ Chromium is unable to recover your settings.
       </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 -->