imgICache Interface

 Evict images from the cache.

 @param chrome If TRUE,  evict only chrome images.
               If FALSE, evict everything except chrome images.

void clearCache(in boolean chrome)

 Find Properties
 Used to get properties such as 'type' and 'content-disposition'
 'type' is a nsISupportsCString containing the images' mime type such as 'image/png'
 'content-disposition' will be a nsISupportsCString containing the header
 If you call this before any data has been loaded from a URI, it will succeed,
 but come back empty.

 @param uri The URI to look up.
 @returns NULL if the URL was not found in the cache

nsIProperties findEntryProperties(in nsIURI uri)

 Evict images from the cache.

 @param uri The URI to remove.
 @return NS_OK if \a uri was removed from the cache.
         NS_ERROR_NOT_AVAILABLE if \a uri was unable to be removed from the cache.

void removeEntry(in nsIURI uri)