Removed unnecessary mutable in SiblingData.

third_party/WebKit/Source/core/css/invalidation/StyleInvalidator.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef StyleInvalidator_h
 #define StyleInvalidator_h
 
 #include "core/css/invalidation/PendingInvalidations.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Noncopyable.h"
@@ skipping 51 matching lines @@
     };
 
     class SiblingData {
         STACK_ALLOCATED();
     public:
         SiblingData()
             : m_elementIndex(0)
         { }
 
         void pushInvalidationSet(const SiblingInvalidationSet&);
-        bool matchCurrentInvalidationSets(Element&, RecursionData&) const;
+        bool matchCurrentInvalidationSets(Element&, RecursionData&);
 
         bool isEmpty() const { return m_invalidationEntries.isEmpty(); }
         void advance() { m_elementIndex++; }
 
     private:
         struct Entry {
             DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
             Entry(const SiblingInvalidationSet* invalidationSet, unsigned invalidationLimit)
                 : m_invalidationSet(invalidationSet)
                 , m_invalidationLimit(invalidationLimit)
             {}
 
             const SiblingInvalidationSet* m_invalidationSet;
             unsigned m_invalidationLimit;
         };
 
-        mutable Vector<Entry, 16> m_invalidationEntries;
+        Vector<Entry, 16> m_invalidationEntries;
         unsigned m_elementIndex;
     };
 
     bool invalidate(Element&, RecursionData&, SiblingData&);
     bool invalidateShadowRootChildren(Element&, RecursionData&);
     bool invalidateChildren(Element&, RecursionData&);
     void invalidateSlotDistributedElements(HTMLSlotElement&, const RecursionData&) const;
     bool checkInvalidationSetsAgainstElement(Element&, RecursionData&, SiblingData&);
     void pushInvalidationSetsForElement(Element&, RecursionData&, SiblingData&);
 
@@ skipping 31 matching lines @@
     using PendingInvalidationMap = HeapHashMap<Member<Element>, OwnPtr<PendingInvalidations>>;
 
     PendingInvalidations& ensurePendingInvalidations(Element&);
 
     PendingInvalidationMap m_pendingInvalidationMap;
 };
 
 } // namespace blink
 
 #endif // StyleInvalidator_h