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Chrome serving resource from cache when it is not present in cache-manifest
<html id="html" xmlns="http://www.w3.org/1999/xhtml" manifest="Portal/CacheManifestHandler.ashx">

HTTP/1.1 200 OK
Cache-Control: no-cache
Pragma: no-cache
Content-Type: text/cache-manifest; charset=utf-8
Expires: -1
Server: Microsoft-IIS/7.5
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
Date: Fri, 20 Apr 2012 15:56:20 GMT
Content-Length: 56

CACHE MANIFEST
NETWORK:
*
#Timestamp: 634705337615835020

HTTP/1.1 200 OK
Cache-Control: no-cache
Pragma: no-cache
Content-Type: text/javascript; charset=utf-8
Expires: -1
Server: Microsoft-IIS/7.5
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
Date: Fri, 20 Apr 2012 15:36:33 GMT
Content-Length: 74

document.location='/Portal/Login.aspx?ReturnUrl=%2fPortal%2fDefault.aspx';