Drop some unused code

src/accessors.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_ACCESSORS_H_
 #define V8_ACCESSORS_H_
 
 #include "src/allocation.h"
 #include "src/globals.h"
 
@@ skipping 50 matching lines @@
     k##name##Getter, \
     k##name##Setter,
   ACCESSOR_INFO_LIST(ACCESSOR_INFO_DECLARATION)
 #undef ACCESSOR_INFO_DECLARATION
     descriptorCount
   };
 
   // Accessor functions called directly from the runtime system.
   static Handle<Object> FunctionSetPrototype(Handle<JSFunction> object,
                                              Handle<Object> value);
-  static Handle<Object> FunctionGetPrototype(Handle<JSFunction> object);
   static Handle<Object> FunctionGetArguments(Handle<JSFunction> object);
 
   // Accessor infos.
   static Handle<AccessorInfo> MakeModuleExport(
       Handle<String> name, int index, PropertyAttributes attributes);
 
   // Returns true for properties that are accessors to object fields.
   // If true, *object_offset contains offset of object field.
   template <class T>
   static bool IsJSObjectFieldAccessor(typename T::TypeHandle type,
@@ skipping 13 matching lines @@
 
 
  private:
   // Helper functions.
   static Handle<Object> FlattenNumber(Isolate* isolate, Handle<Object> value);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ACCESSORS_H_