Add a separate warning message for topSites permission.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 60a7c2f06ccb89cd06dadbb8937ff90860be7d76..7e5748dbe874a2a905ca4bda4c72b6d28562dca5 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -4309,6 +4309,9 @@ Make sure you do not expose any sensitive information.
       <message name="IDS_EXTENSION_PROMPT_WARNING_MANAGEMENT" desc="Permisson string for access to extension management.">
         Manage your apps, extensions, and themes
       </message>
+      <message name="IDS_EXTENSION_PROMPT_WARNING_TOPSITES" desc="Permission string for access to the list of most frequently visited websites.">
+        Read a list of your most frequently visited websites
+      </message>
       <message name="IDS_EXTENSION_PROMPT_WARNING_HISTORY_READ" desc="Permission string for access to browsing history.">
         Read your browsing history
       </message>
@@ -12973,7 +12976,7 @@ Some features may be unavailable.  Please check that the profile exists and you
     </message>
     <message name="IDS_DISALLOW_AUTOFILL_SYNC_CREDENTIAL_FOR_REAUTH" desc="The text for the choice to not allow autofilling for reauth pages in about:flags">
       Disallow for reauth
-    </message>    
+    </message>
 
     <!-- Update Recommended dialog -->
     <if expr="not chromeos">