Cleanup unused Dart API Dart_IdentityHash

runtime/include/dart_api.h

 /*
  * Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
 
 #ifndef RUNTIME_INCLUDE_DART_API_H_
 #define RUNTIME_INCLUDE_DART_API_H_
 
 /** \mainpage Dart Embedding API Reference
@@ skipping 417 matching lines @@
  * argument handles refer to the same object.
  *
  * \param obj1 An object to be compared.
  * \param obj2 An object to be compared.
  *
  * \return True if the objects are identically equal.  False otherwise.
  */
 DART_EXPORT bool Dart_IdentityEquals(Dart_Handle obj1, Dart_Handle obj2);
 
 /**
- * Returns a hash code for the argument. The hash code of objects that are equal
- * according to Dart_IdentityEquals will return the same hash code, but the hash
- * codes of non-equal objects are not necessarily distinct.
- *
- * \param obj An object for which to derive a hash code.
- *
- * \return A hash code for the parameter.
- */
-DART_EXPORT uint64_t Dart_IdentityHash(Dart_Handle obj);
-
-/**
  * Allocates a handle in the current scope from a persistent handle.
  */
 DART_EXPORT Dart_Handle Dart_HandleFromPersistent(Dart_PersistentHandle object);
 
 /**
  * Allocates a handle in the current scope from a weak persistent handle.
  */
 DART_EXPORT Dart_Handle
 Dart_HandleFromWeakPersistent(Dart_WeakPersistentHandle object);
 
@@ skipping 2880 matching lines @@
  *  compiled with DART_PRECOMPILED_RUNTIME).
  */
 DART_EXPORT bool Dart_IsPrecompiledRuntime();
 
 /**
  *  Print a native stack trace. Used for crash handling.
  */
 DART_EXPORT void Dart_DumpNativeStackTrace(void* context);
 
 #endif /* INCLUDE_DART_API_H_ */ /* NOLINT */