base: Remove a copy of and copy ctor from SequenceAndSortKey.

base/task_scheduler/priority_queue.h

Index: base/task_scheduler/priority_queue.h
diff --git a/base/task_scheduler/priority_queue.h b/base/task_scheduler/priority_queue.h
index 8676c932c75e5906e14f1527e2e2a86ef16501be..75646842668c6f300c485951d346b9946f02b53c 100644
--- a/base/task_scheduler/priority_queue.h
+++ b/base/task_scheduler/priority_queue.h
@@ -32,9 +32,6 @@ class BASE_EXPORT PriorityQueue {
     // Constructs a SequenceAndSortKey with the given |sequence| and |sort_key|.
     SequenceAndSortKey(scoped_refptr<Sequence> sequence,
                        const SequenceSortKey& sort_key);
-
-    SequenceAndSortKey(const SequenceAndSortKey& other);

[danakj, 2016/04/19 20:11:54]

DISALLOW_COPY_AND_ASSIGN then?

[vmpstr, 2016/04/19 20:14:17]

Done. I didn't do this initially, because it's unclear to me whether this is
meant to be non-copyable or it just happens that we're currently not doing any
copies. 

-
     ~SequenceAndSortKey();
 
     // Returns true if this is a null SequenceAndSortKey.