Site Settings Desktop: Implement the 'Clear on exit' menu for Cookies.

chrome/app/settings_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Settings-specific strings (included from generated_resources.grd). -->
 <grit-part>
   <!-- About Page -->
   <if expr="chromeos">
     <message name="IDS_SETTINGS_ABOUT_PAGE_CHECK_FOR_UPDATES" desc="The button label to check for updates and apply (download and install) if found">
       Check for updates
     </message>
     <message name="IDS_SETTINGS_ABOUT_PAGE_CURRENT_CHANNEL_STABLE" desc="The stable label in the message about current channel.">
       stable
@@ skipping 1071 matching lines @@
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_BLOCKED_RECOMMENDED" desc="A generic Blocked label to show in Site Settings when Blocked is the recommended option.">
     Blocked (recommended)
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_ALLOW" desc="Label for allow sites in site settings.">
     Allow
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_BLOCK" desc="Label for add block sites in site settings.">
     Block
   </message>
+  <message name="IDS_SETTINGS_SITE_SETTINGS_SESSION_ONLY" desc="Label for sites in site settings allowing cookies for the current session only.">
+    Clear on exit
+  </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_EXCEPTIONS" desc="Label for exception sites in site settings.">
     Exceptions
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_ADD_SITE" desc="Label for add site button in site settings.">
     Add Site
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_SITE_URL" desc="Label for site URL text entry in site settings.">
     Site URL
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_ALLOW_MENU" desc="Label for the menu item to allow permission for a particular site.">
     Allow
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_BLOCK_MENU" desc="Label for the menu item to block permission for a particular site.">
     Block
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_RESET_MENU" desc="Label for the menu item to reset the permission for a particular site (make it ask you again next time).">
     Reset to ask
   </message>
+  <message name="IDS_SETTINGS_SITE_SETTINGS_SESSION_ONLY_MENU" desc="Label for the menu item to set cookies to be deleted on browser exit.">
+    Clear on exit
+  </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_USAGE" desc="The Usage header, used to group disk and battery usage information on the Site Details page.">
     Usage
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_PERMISSIONS" desc="The Permissions header, used to group together permissions, such as Geolocation, on the Site Details page.">
     Permissions
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_CLEAR_BUTTON" desc="The Clear and Reset button, used to clear all permissions and storage for a given site.">
     Clear &amp; Reset
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_DELETE" desc="Label for the trashcan icon used to delete storage on the Site Details page.">
@@ skipping 432 matching lines @@
       System
     </message>
     <message name="IDS_SETTINGS_SYSTEM_HARDWARE_ACCELERATION_LABEL" desc="Label for the checkbox that forces Chrome to render via hardware acceleration (GPU) when available.">
       Use hardware acceleration when available
     </message>
     <message name="IDS_SETTINGS_SYSTEM_PROXY_SETTINGS_BUTTON" desc="Text for the button that changes a user's network proxy settings.">
       Change proxy settings
     </message>
   </if>
 </grit-part>