Dispatch slotchange events in "notify mutation observers" steps

third_party/WebKit/Source/core/html/HTMLSlotElement.h

Index: third_party/WebKit/Source/core/html/HTMLSlotElement.h
diff --git a/third_party/WebKit/Source/core/html/HTMLSlotElement.h b/third_party/WebKit/Source/core/html/HTMLSlotElement.h
index 609f822aad5882cce27db8376d441e122283342f..babaa81f0bc012e673175f171786abf03b28ff57 100644
--- a/third_party/WebKit/Source/core/html/HTMLSlotElement.h
+++ b/third_party/WebKit/Source/core/html/HTMLSlotElement.h
@@ -93,6 +93,8 @@ class CORE_EXPORT HTMLSlotElement final : public HTMLElement {
 
   bool supportsDistribution() const { return isInV1ShadowTree(); }
   void didSlotChange(SlotChangeType);
+  void dispatchSlotChangeEvent();
+  void clearSlotChangeEventEnqueued() { m_slotchangeEventEnqueued = false; }
 
   static AtomicString normalizeSlotName(const AtomicString&);
 
@@ -106,7 +108,6 @@ class CORE_EXPORT HTMLSlotElement final : public HTMLElement {
   void willRecalcStyle(StyleRecalcChange) final;
 
   void enqueueSlotChangeEvent();
-  void dispatchSlotChangeEvent();
 
   HeapVector<Member<Node>> m_assignedNodes;
   HeapVector<Member<Node>> m_distributedNodes;