Move StyleInvalidator to StyleEngine.

Source/core/css/invalidation/StyleInvalidator.h

Index: Source/core/css/invalidation/StyleInvalidator.h
diff --git a/Source/core/css/invalidation/StyleInvalidator.h b/Source/core/css/invalidation/StyleInvalidator.h
index b0d33e2469244b71b905ea99f18e9b114ee7fd95..ae8a508dbc06c5e7955610d850eb8fb14d9c5b07 100644
--- a/Source/core/css/invalidation/StyleInvalidator.h
+++ b/Source/core/css/invalidation/StyleInvalidator.h
@@ -49,7 +49,7 @@ private:
         bool treeBoundaryCrossing() const { return m_treeBoundaryCrossing; }
         bool insertionPointCrossing() const { return m_insertionPointCrossing; }
 
-        typedef Vector<const DescendantInvalidationSet*, 16> InvalidationSets;
+        using InvalidationSets = Vector<const DescendantInvalidationSet*, 16>;
         InvalidationSets m_invalidationSets;
         bool m_invalidateCustomPseudo;
         bool m_wholeSubtreeInvalid;
@@ -89,8 +89,8 @@ private:
         RecursionData* m_data;
     };
 
-    typedef WillBeHeapVector<RefPtrWillBeMember<DescendantInvalidationSet>> InvalidationList;
-    typedef WillBeHeapHashMap<RawPtrWillBeMember<Element>, OwnPtrWillBeMember<InvalidationList>> PendingInvalidationMap;
+    using InvalidationList = WillBeHeapVector<RefPtrWillBeMember<DescendantInvalidationSet>>;
+    using PendingInvalidationMap = WillBeHeapHashMap<RawPtrWillBeMember<Element>, OwnPtrWillBeMember<InvalidationList>>;
 
     InvalidationList& ensurePendingInvalidationList(Element&);