Bug 1379095 - add nsIRequest in nsAboutCacheEntry::Channel QI. r=mayhemer

nsAboutCacheEntry::Channel is introduced by Bug 1266196. Assert_NoQueryNeeded() check is failed
due to nsAboutCacheEntry::Channel return nullptr while QI into a nsCOMPtr<nsIRequest> pointer.

MozReview-Commit-ID: 4lYeN4lNtTm

--HG--
extra : rebase_source : 633bcd0911cc9e9703e9137a398db02fdd1f5aa4

netwerk/protocol/about/nsAboutCacheEntry.cpp

@@ -87,6 +87,7 @@ NS_IMPL_ISUPPORTS(nsAboutCacheEntry::Channel,
                   nsICacheEntryOpenCallback,
                   nsICacheEntryMetaDataVisitor,
                   nsIStreamListener,
+                  nsIRequest,
                   nsIChannel)
 
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