Removed return codes for nsCacheEntryHashtable::RemoveEntry() and nsCacheDevice::DoomEntry().
Added doomEntriesIfExpired flag to nsCacheSession and nsCacheRequest, and check the flag in nsCacheService::ActivateEntry()
Added lastModified attribute to nsCacheEntryDescriptor and mLastModified data member to nsCacheEntry. mLastModified is updated when data or meta data is changed.
Deque requests if descriptor allocation fails. Delete requests after calling proxy in async open cache entry path.
Cleaned up the logic of doom.
git-svn-id: svn://10.0.0.236/trunk@88929 18797224-902f-48f8-a5cc-f745e15eee43
