Bug 1469769 - Part 6: Replace non-failing NS_NOTREACHED with MOZ_ASSERT_UNREACHABLE. r=froydnj

This patch is an automatic replacement of s/NS_NOTREACHED/MOZ_ASSERT_UNREACHABLE/. Reindenting long lines and whitespace fixups follow in patch 6b.

MozReview-Commit-ID: 5UQVHElSpCr

dom/xhr/XMLHttpRequestMainThread.cpp

@@ -3415,7 +3415,8 @@ void
 XMLHttpRequestMainThread::HandleTimeoutCallback()
 {
   if (mState == XMLHttpRequestBinding::DONE) {
-    NS_NOTREACHED("XMLHttpRequestMainThread::HandleTimeoutCallback with completed request");
+    MOZ_ASSERT_UNREACHABLE("XMLHttpRequestMainThread::HandleTimeoutCallback "
+                           "with completed request");
     // do nothing!
     return;
   }