Removed unnecessary mutable in SiblingData.

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

 // 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.
 
 #include "core/css/invalidation/StyleInvalidator.h"
 
 #include "core/css/invalidation/InvalidationSet.h"
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/dom/ElementTraversal.h"
@@ skipping 152 matching lines @@
 void StyleInvalidator::SiblingData::pushInvalidationSet(const SiblingInvalidationSet& invalidationSet)
 {
     unsigned invalidationLimit;
     if (invalidationSet.maxDirectAdjacentSelectors() == UINT_MAX)
         invalidationLimit = UINT_MAX;
     else
         invalidationLimit = m_elementIndex + invalidationSet.maxDirectAdjacentSelectors();
     m_invalidationEntries.append(Entry(&invalidationSet, invalidationLimit));
 }
 
-bool StyleInvalidator::SiblingData::matchCurrentInvalidationSets(Element& element, RecursionData& recursionData) const
+bool StyleInvalidator::SiblingData::matchCurrentInvalidationSets(Element& element, RecursionData& recursionData)
 {
     bool thisElementNeedsStyleRecalc = false;
     ASSERT(!recursionData.wholeSubtreeInvalid());
 
     unsigned index = 0;
     while (index < m_invalidationEntries.size()) {
         if (m_elementIndex > m_invalidationEntries[index].m_invalidationLimit) {
             // m_invalidationEntries[index] only applies to earlier siblings. Remove it.
             m_invalidationEntries[index] = m_invalidationEntries.last();
             m_invalidationEntries.removeLast();
@@ skipping 143 matching lines @@
             distributedNode->setNeedsStyleRecalc(LocalStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::StyleInvalidator));
     }
 }
 
 DEFINE_TRACE(StyleInvalidator)
 {
     visitor->trace(m_pendingInvalidationMap);
 }
 
 } // namespace blink