Mark shouldMarkObject(), arenaForNormalPage() accessors as const.

third_party/WebKit/Source/platform/heap/MarkingVisitorImpl.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 MarkingVisitorImpl_h
 #define MarkingVisitorImpl_h
 
 #include "platform/heap/Heap.h"
 #include "platform/heap/ThreadState.h"
 #include "platform/heap/Visitor.h"
 #include "wtf/Allocator.h"
-#include "wtf/Functional.h"
-#include "wtf/HashFunctions.h"
-#include "wtf/Locker.h"
-#include "wtf/TypeTraits.h"
 
 namespace blink {
 
 template <typename Derived>
 class MarkingVisitorImpl {
     USING_FAST_MALLOC(MarkingVisitorImpl);
 protected:
     inline void markHeader(HeapObjectHeader* header, const void* objectPointer, TraceCallback callback)
     {
         ASSERT(header);
@@ skipping 100 matching lines @@
 private:
     static void markNoTracingCallback(Visitor* visitor, void* object)
     {
         visitor->markNoTracing(object);
     }
 };
 
 } // namespace blink
 
 #endif