Add a button to clear local storage for a given origin to Website Settings dialog.

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 b1004972728771acb4d31273ec7d8b97e8caae9f..20b8e926dd3ec5995c655307c6b9403e19e5dc33 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -7992,6 +7992,10 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_WEBSITE_SETTINGS_STORAGE_USED" desc="The status text for how much local storage a website origin is using.">
         <ph name="USAGE">$1<ex>2.0 KB</ex></ph> stored data
       </message>
+      <message name="IDS_WEBSITE_SETTINGS_STORAGE_CLEAR_BUTTON" desc="The 'Clear' button in the Website Settings single site view dialog.">
+        Clear
+      </message>
+
 
       <!-- Automatic updates -->
       <if expr="is_macosx">
@@ -12998,7 +13002,7 @@ 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">