Bug 1166349: Use a fallible allocation in nsXMLHttpRequest::StreamReaderFunc. r=sicking,smaug.

--HG--
extra : rebase_source : be67c741928dbc8fbda8df4c0e1b7674e2a2942a

dom/base/nsXMLHttpRequest.cpp

@@ -1857,7 +1857,7 @@ nsXMLHttpRequest::StreamReaderFunc(nsIInputStream* in,
              xmlHttpRequest->mResponseXML) {
     // Copy for our own use
     uint32_t previousLength = xmlHttpRequest->mResponseBody.Length();
-    xmlHttpRequest->mResponseBody.Append(fromRawSegment,count);
+    xmlHttpRequest->mResponseBody.Append(fromRawSegment, count, fallible);
     if (count > 0 && xmlHttpRequest->mResponseBody.Length() == previousLength) {
       return NS_ERROR_OUT_OF_MEMORY;
     }