Last-Modified header should not be stripped with ModPagespeedModifyCachingHeaders off

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So while ModPagespeedModifyCachingHeaders off seems to restore the 
Cache-Control and Expires headers properly, it appears that Last-Modified still 
gets stripped. Is this intentional?

Please see the following URLs to see the difference:
http://status.stackstat.us/
vs
http://status.stackstat.us/?ModPagespeed=off

Original issue reported on code.google.com by jmara...@google.com on 21 Mar 2013 at 12:37

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Original comment by jmara...@google.com on 21 Mar 2013 at 1:01

• Changed state: Started

[GoogleCodeExporter]

Fixed in https://code.google.com/p/modpagespeed/source/detail?r=2639

Original comment by jmara...@google.com on 21 Mar 2013 at 7:56

• Changed state: Fixed

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Original comment by jkar...@google.com on 2 Apr 2013 at 3:40

• Added labels: Milestone-v26, release-note