Bug 935809 - Part 0: Include assertion header in DoublyLinkedList.h. r=waldo

MozReview-Commit-ID: 4G37uslYlOb

mfbt/DoublyLinkedList.h

@@ -12,6 +12,8 @@
 #include <algorithm>
 #include <iterator>
 
+#include "mozilla/Assertions.h"
+
 /**
  * Where mozilla::LinkedList strives for ease of use above all other
  * considerations, mozilla::DoublyLinkedList strives for flexibility. The