Bookmarks: revert ICU plural syntax for "Should we open all these bookmarks?" messsage

chrome/app/bookmarks_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Bookmarks specific strings (included from generated_resources.grd). -->
 <grit-part>
   <!-- Begin of Bookmarks Bar strings-->
   <if expr="not is_android">
     <!-- The following two strings are shown when the user has no bookmarks yet. -->
     <message name="IDS_BOOKMARKS_NO_ITEMS" desc="Text shown when the user has no bookmarks">
       For quick access, place your bookmarks here on the bookmarks bar.
     </message>
     <message name="IDS_BOOKMARK_BAR_IMPORT_LINK" desc="text shown for importing ">
@@ skipping 124 matching lines @@
     </message>
     <message name="IDS_BOOKMARK_BAR_NEW_FOLDER" desc="In Title Case: Menu title for adding a new folder">
       Add &amp;Folder...
     </message>
     <if expr="not is_android">
       <message name="IDS_SHOW_BOOKMARK_BAR" desc="In Title Case: The toggle to show the bookmark bar">
         &amp;Show Bookmarks Bar
       </message>
     </if>
   </if>
-  <message name="IDS_BOOKMARK_BAR_SHOULD_OPEN_ALL" desc="Message in the message box shown if user asks to open a lot of bookmarks in a folder. The number will never be 1. [ICU Syntax]">
-  {TAB_COUNT, plural,
-   =1 {Are you sure you want to open # tab?}
-   other {Are you sure you want to open # tabs?}
-  }
+  <message name="IDS_BOOKMARK_BAR_SHOULD_OPEN_ALL" desc="Message in the message box shown if user asks to open a lot of bookmarks in a folder. The number will always be 15 or more.">
+    Are you sure you want to open <ph name="TAB_COUNT">$1<ex>20</ex></ph> tabs?
   </message>
   <!-- End of Bookmarks Bar Context Menu strings. -->
 
   <!-- Begin of Bookmarks Bubble strings. -->
   <if expr="not use_titlecase">
     <message name="IDS_BOOKMARK_BUBBLE_PAGE_BOOKMARKED" desc="Title of the bubble after bookmarking a page.">
       Bookmark added!
     </message>
   </if>
   <if expr="use_titlecase">
@@ skipping 189 matching lines @@
   </if>
   <!-- End of Bookmarks Menu (in the Main Menu) strings. -->
 
   <!-- Begin of Bookmark Star button strings. -->
   <message name="IDS_TOOLTIP_STARRED" desc="The tooltip shown when you hover the star button in the right side of the location bar and the current page is bookmarked.">
     Edit bookmark for this page
   </message>
   <!-- End of Bookmark Star button strings. -->
 
 </grit-part>