[runtime] Replace hidden_string with a 0-hash-code private symbol

src/isolate.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_ISOLATE_H_
 #define V8_ISOLATE_H_
 
 #include <queue>
 #include <set>
 
@@ skipping 665 matching lines @@
       Handle<JSObject> error_object, Handle<Object> caller);
   Handle<JSArray> GetDetailedStackTrace(Handle<JSObject> error_object);
   Handle<JSArray> GetDetailedFromSimpleStackTrace(
       Handle<JSObject> error_object);
 
   // Returns if the given context may access the given global object. If
   // the result is false, the pending exception is guaranteed to be
   // set.
   bool MayAccess(Handle<Context> accessing_context, Handle<JSObject> receiver);
 
-  bool IsInternallyUsedPropertyName(Handle<Object> name);
-
   void SetFailedAccessCheckCallback(v8::FailedAccessCheckCallback callback);
   void ReportFailedAccessCheck(Handle<JSObject> receiver);
 
   // Exception throwing support. The caller should use the result
   // of Throw() as its return value.
   Object* Throw(Object* exception, MessageLocation* location = NULL);
   Object* ThrowIllegalOperation();
 
   template <typename T>
   MUST_USE_RESULT MaybeHandle<T> Throw(Handle<Object> exception,
@@ skipping 861 matching lines @@
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ISOLATE_H_