remove undetectable strings

src/objects.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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 8967 matching lines @@
   // a flat vector of char or of uc16.
   // If the string isn't flat, and therefore doesn't have flat content, the
   // returned structure will report so, and can't provide a vector of either
   // kind.
   FlatContent GetFlatContent();
 
   // Returns the parent of a sliced string or first part of a flat cons string.
   // Requires: StringShape(this).IsIndirect() && this->IsFlat()
   inline String* GetUnderlying();
 
-  // Mark the string as an undetectable object. It only applies to
-  // one-byte and two-byte string types.
-  bool MarkAsUndetectable();
-
   // String equality operations.
   inline bool Equals(String* other);
   inline static bool Equals(Handle<String> one, Handle<String> two);
   bool IsUtf8EqualTo(Vector<const char> str, bool allow_prefix_match = false);
   bool IsOneByteEqualTo(Vector<const uint8_t> str);
   bool IsTwoByteEqualTo(Vector<const uc16> str);
 
   // Return a UTF8 representation of the string.  The string is null
   // terminated but may optionally contain nulls.  Length is returned
   // in length_output if length_output is not a null pointer  The string
@@ skipping 1963 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_