Bug 1201716 - Missing status check in SafeBrowsing::Merge causes SafeBrowsing malfunction. r=francois

MozReview-Commit-ID: CtF4Gczkoa1

--HG--
extra : transplant_source : %D9E%045%FF%EB%91%04%12%D3%E2%E3%E9R%15z-%01%22%8E

toolkit/components/url-classifier/HashStore.cpp

@@ -551,7 +551,9 @@ Merge(ChunkSet* aStoreChunks,
   // to make the chunkranges continuous.
   aStoreChunks->Merge(aUpdateChunks);
 
-  aStorePrefixes->AppendElements(adds, fallible);
+  if (!aStorePrefixes->AppendElements(adds, fallible))
+    return NS_ERROR_OUT_OF_MEMORY;
+
   EntrySort(*aStorePrefixes);
 
   return NS_OK;