Bug 1124784: Annotate HttpBaseChannel::GetProxyURI as MOZ_OVERRIDE. r=mcmanus

DONTBUILD because just backing out & re-landing to fix bug number

netwerk/protocol/http/HttpBaseChannel.h

@@ -190,7 +190,7 @@ public:
   NS_IMETHOD ForceNoIntercept() MOZ_OVERRIDE;
   NS_IMETHOD GetTopWindowURI(nsIURI **aTopWindowURI) MOZ_OVERRIDE;
   NS_IMETHOD ContinueBeginConnect() MOZ_OVERRIDE;
-  NS_IMETHOD GetProxyURI(nsIURI **proxyURI);
+  NS_IMETHOD GetProxyURI(nsIURI **proxyURI) MOZ_OVERRIDE;
 
   inline void CleanRedirectCacheChainIfNecessary()
   {