Harden more runtime functions

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 "allocation.h"
 #include "assert-scope.h"
 #include "builtins.h"
@@ skipping 7578 matching lines @@
   inline bool has_instance_prototype();
   inline Object* prototype();
   inline Object* instance_prototype();
   static void SetPrototype(Handle<JSFunction> function,
                            Handle<Object> value);
   static void SetInstancePrototype(Handle<JSFunction> function,
                                    Handle<Object> value);
 
   // After prototype is removed, it will not be created when accessed, and
   // [[Construct]] from this function will not be allowed.
-  void RemovePrototype();
+  bool RemovePrototype();
   inline bool should_have_prototype();
 
   // Accessor for this function's initial map's [[class]]
   // property. This is primarily used by ECMA native functions.  This
   // method sets the class_name field of this function's initial map
   // to a given value. It creates an initial map if this function does
   // not have one. Note that this method does not copy the initial map
   // if it has one already, but simply replaces it with the new value.
   // Instances created afterwards will have a map whose [[class]] is
   // set to 'value', but there is no guarantees on instances created
@@ skipping 3473 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_