[heap] Simplify clearing of normalized map caches.

src/heap/heap.h

 // Copyright 2012 the V8 project 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 V8_HEAP_HEAP_H_
 #define V8_HEAP_HEAP_H_
 
 #include <cmath>
 #include <map>
 
@@ skipping 848 matching lines @@
 
   // Check new space expansion criteria and expand semispaces if it was hit.
   void CheckNewSpaceExpansionCriteria();
 
   void VisitExternalResources(v8::ExternalResourceVisitor* visitor);
 
   // An object should be promoted if the object has survived a
   // scavenge operation.
   inline bool ShouldBePromoted(Address old_address, int object_size);
 
-  void ClearNormalizedMapCaches();
-
   void IncrementDeferredCount(v8::Isolate::UseCounterFeature feature);
 
   // Completely clear the Instanceof cache (to stop it keeping objects alive
   // around a GC).
   inline void CompletelyClearInstanceofCache();
 
   inline uint32_t HashSeed();
 
   inline int NextScriptId();
 
@@ skipping 1738 matching lines @@
   friend class LargeObjectSpace;
   friend class NewSpace;
   friend class PagedSpace;
   DISALLOW_COPY_AND_ASSIGN(AllocationObserver);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_HEAP_H_