Bug 1359653: Part 3 - Add a clear() method and move asssignment operator to AutoCleanLinkedList. r=waldo

MozReview-Commit-ID: 2bUTMPviJzg

--HG--
extra : source : b49bd726c8a6e955c672df17b2b9134ab3ad34d5

mfbt/LinkedList.h

@@ -647,6 +647,17 @@ class AutoCleanLinkedList : public LinkedList<T>
 {
 public:
   ~AutoCleanLinkedList()
+  {
+    clear();
+  }
+
+  AutoCleanLinkedList& operator=(AutoCleanLinkedList&& aOther)
+  {
+    LinkedList<T>::operator=(Forward<LinkedList<T>>(aOther));
+    return *this;
+  }
+
+  void clear()
   {
     while (T* element = this->popFirst()) {
       delete element;