Bug 1123009 - Make nsAppDirectoryEnumerator::mProvider an nsCOMPtr; r=froydnj

xpcom/io/nsAppFileLocationProvider.cpp

@@ -457,7 +457,7 @@ public:
   }
 
 protected:
-  nsIDirectoryServiceProvider* mProvider;
+  nsCOMPtr<nsIDirectoryServiceProvider> mProvider;
   const char** mCurrentKey;
   nsCOMPtr<nsIFile> mNext;