StorageErrorCallback should pass a DOMError and not a DOMException

http://www.w3.org/TR/quota-api/#storageerrorcallback-callback

BUG=260333

Review URL: https://chromiumcodereview.appspot.com/19273002

git-svn-id: svn://svn.chromium.org/blink/trunk@154426 bbb929c8-8fbe-4397-9dbb-9b2b20218538