Add a "session only" policy to the content settings.

chrome/browser/in_process_webkit/dom_storage_area.cc

Index: chrome/browser/in_process_webkit/dom_storage_area.cc
diff --git a/chrome/browser/in_process_webkit/dom_storage_area.cc b/chrome/browser/in_process_webkit/dom_storage_area.cc
index a0ef9b9aaf6e90798ace5705d51935d597e4f802..6aefa21571f087a66b9b740f807c10a1feb9896d 100644
--- a/chrome/browser/in_process_webkit/dom_storage_area.cc
+++ b/chrome/browser/in_process_webkit/dom_storage_area.cc
@@ -113,8 +113,5 @@ bool DOMStorageArea::CheckContentSetting(
     content_setting = request.WaitOnResponse();
   }
 
-  if (content_setting == CONTENT_SETTING_ALLOW)
-    return true;
-  DCHECK(content_setting == CONTENT_SETTING_BLOCK);
-  return false;
+  return (content_setting != CONTENT_SETTING_BLOCK);
 }