Add string for cache and cookies to important sites

chrome/app/settings_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Settings-specific strings (included from generated_resources.grd). -->
 <grit-part>
   <!-- Main Page -->
   <if expr="chromeos">
     <message name="IDS_SETTINGS_SECONDARY_USER_BANNER" desc="Banner displayed in settings page when the user is secondary in a multi-profile session.">
       Some settings belonging to <ph name="PRIMARY_EMAIL">$1<ex>john@google.com</ex></ph> are being shared with you. These settings only affect your account when using multiple sign-in.
     </message>
   </if>
 
@@ skipping 852 matching lines @@
   </message>
   <message name="IDS_SETTINGS_CLEAR_DATA_EVERYTHING" desc="deletion period combo box: everything. In English this finishes the sentence that starts with 'Delete the following items from'.">
     the beginning of time
   </message>
   <message name="IDS_SETTINGS_CLEAR_DATA_SOME_STUFF_REMAINS" desc="A text shown at the bottom of the Clear Browsing Data dialog, informing the user that some data types will not be cleared.">
     Some settings that may reflect browsing habits will not be cleared.
   </message>
   <message name="IDS_SETTINGS_CLEAR_DATA_CLEARS_SYNCED_DATA" desc="Information that data which is synced across user's devices will be deleted from all those devices.">
     This clears synced data from all devices.
   </message>
-  <message name="IDS_SETTINGS_IMPORTANT_SITES_SUBTITLE" desc="Subtitle for the important sites dialog.">
+  <message name="IDS_SETTINGS_IMPORTANT_SITES_SUBTITLE_COOKIES" desc="Subtitle for the important sites dialog.">
     This will clear cookies and site data for all sites, including
   </message>
+  <message name="IDS_SETTINGS_IMPORTANT_SITES_SUBTITLE_COOKIES_AND_CACHE" desc="Subtitle for the important sites dialog.">
+    This will clear cookies and cache for all sites, including
+  </message>
   <message name="IDS_SETTINGS_IMPORTANT_SITES_CONFIRM" desc="Text for confirmation button of the important sites dialog.">
     Confirm
   </message>
   <message name="IDS_SETTINGS_NOTIFICATION_WARNING" desc="A warning that notifications will be disabled by deleting cookies for this site.">
     Notifications will be disabled
   </message>
 
   <!-- Printing -->
   <message name="IDS_SETTINGS_PRINTING" desc="Title of the printing page and navigation item to get there.">
     Printing
@@ skipping 2256 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_LABEL" desc="Label for the control that opens a user's network proxy settings.">
       Open proxy settings
     </message>
   </if>
 </grit-part>