Replace HeapListHashSet with HeapLinkedHashSet in InspectorDOMAgent

ListHashSet is deprecated in favor of LinkedHashSet.

HeapLinkedHashSet's invalidate iterators when the container is
modified.  This does not happen in this usage, so replacement is
simple.

Bug: 614112
Change-Id: I43ed7c4c12ed5b1c6cdb369210a60c3da2358bb2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1641162Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Commit-Queue: Abhijeet Kandalkar <abhijeet@igalia.com>
Cr-Commit-Position: refs/heads/master@{#666328}

third_party/blink/renderer/core/inspector/inspector_dom_agent.cc

@@ -999,7 +999,7 @@ Response InspectorDOMAgent::performSearch(
     attribute_query = attribute_query.Left(attribute_query.length() - 1);
 
   HeapVector<Member<Document>> docs = Documents();
-  HeapListHashSet<Member<Node>> result_collector;
+  HeapLinkedHashSet<Member<Node>> result_collector;
 
   for (Document* document : docs) {
     Node* document_element = document->documentElement();