Verify a bit more about external strings

src/heap/heap-inl.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_INL_H_
 #define V8_HEAP_HEAP_INL_H_
 
 #include <cmath>
 
 #include "src/base/platform/platform.h"
@@ skipping 269 matching lines @@
       StringHasher::AddCharacterCore(raw_allocations_hash_, c2);
 }
 
 
 void Heap::PrintAlloctionsHash() {
   uint32_t hash = StringHasher::GetHashCore(raw_allocations_hash_);
   PrintF("\n### Allocations = %u, hash = 0x%08x\n", allocations_count_, hash);
 }
 
 
-void Heap::FinalizeExternalString(String* string) {
-  DCHECK(string->IsExternalString());
-  v8::String::ExternalStringResourceBase** resource_addr =
-      reinterpret_cast<v8::String::ExternalStringResourceBase**>(
-          reinterpret_cast<byte*>(string) + ExternalString::kResourceOffset -
-          kHeapObjectTag);
-
-  // Dispose of the C++ object if it has not already been disposed.
-  if (*resource_addr != NULL) {
-    (*resource_addr)->Dispose();
-    *resource_addr = NULL;
-  }
-}
-
-
 bool Heap::InNewSpace(Object* object) {
   bool result = new_space_.Contains(object);
   DCHECK(!result ||                 // Either not in new space
          gc_state_ != NOT_IN_GC ||  // ... or in the middle of GC
          InToSpace(object));        // ... or in to-space (where we allocate).
   return result;
 }
 
 
 bool Heap::InNewSpace(Address address) { return new_space_.Contains(address); }
@@ skipping 367 matching lines @@
 
 void VerifySmisVisitor::VisitPointers(Object** start, Object** end) {
   for (Object** current = start; current < end; current++) {
     CHECK((*current)->IsSmi());
   }
 }
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_HEAP_INL_H_