Revert of [es6] Bound function names

test/mjsunit/function-bind-name.js

-// Copyright 2015 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.
-
-function f() {}
-var fb = f.bind({});
-assertEquals('bound f', fb.name);
-assertEquals('function bound f() { [native code] }', fb.toString());
-
-Object.defineProperty(f, 'name', {value: 42});
-var fb2 = f.bind({});
-assertEquals('bound ', fb2.name);
-assertEquals('function bound () { [native code] }', fb2.toString());