Update close guest string for translation

This CL offers both singular and plural options for the close button
string in guest mode to allow translation as mentioned in b/168224245.

Bug: none.
Change-Id: I6b3c0d0e4bbd77e2e37035e62d7068358278ebe8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2410031Reviewed-by: Ramin Halavati <rhalavati@chromium.org>
Commit-Queue: Mariam Ali <alimariam@google.com>
Cr-Commit-Position: refs/heads/master@{#806999}

chrome/app/generated_resources.grd

@@ -10605,7 +10605,10 @@ Please help our engineers fix this problem. Tell us what happened right before y
 
    <!-- Guest Profile Menu bubble. -->
     <message name="IDS_GUEST_PROFILE_MENU_CLOSE_BUTTON" desc="The text of the button offering to close all guest windows.">
-      Close guest
+      {0, plural,
+        =1 {Close guest}
+        other {Close guest}
+      }
     </message>
 
     <!-- User happiness tracking survey UI -->

chrome/app/generated_resources_grd/IDS_GUEST_PROFILE_MENU_CLOSE_BUTTON.png.sha1

-7cf633fd6fae2b7fbe23d3c3cf892c15b4dcdd07
\ No newline at end of file
+d5e17649bc7e9f520e5b682e04146df8a2e1e5c4
\ No newline at end of file

chrome/browser/ui/views/profiles/profile_menu_view.cc

@@ -593,14 +593,15 @@ void ProfileMenuView::BuildFeatureButtons() {
 #endif
   }
 
+  int window_count = CountBrowsersFor(profile);
   if (base::FeatureList::IsEnabled(features::kNewProfilePicker) && is_guest) {
     AddFeatureButton(
-        l10n_util::GetStringUTF16(IDS_GUEST_PROFILE_MENU_CLOSE_BUTTON),
+        l10n_util::GetPluralStringFUTF16(IDS_GUEST_PROFILE_MENU_CLOSE_BUTTON,
+                                         window_count),
         base::BindRepeating(&ProfileMenuView::OnExitProfileButtonClicked,
                             base::Unretained(this)),
         vector_icons::kCloseIcon);
   } else {
-    int window_count = CountBrowsersFor(profile);
     if (window_count > 1) {
       AddFeatureButton(
           l10n_util::GetPluralStringFUTF16(IDS_PROFILES_CLOSE_X_WINDOWS_BUTTON,