Remove FLAG_min_preparse_length.

test/mjsunit/eagerly-parsed-lazily-compiled-functions.js

 // Copyright 2016 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.
 
-// Flags: --min-preparse-length=0
-
 // The test functions in this file will be eagerly compiled. The functions
 // inside will be eagerly parsed but lazily compiled.
 
 (function TestLengths() {
   function inner(p1, p2, p3) { }
   assertEquals(3, inner.length);
 })();
 
 (function TestAccessingContextVariables() {
   var in_context = 8;
   function inner() { return in_context; }
   assertEquals(8, inner());
 })();
 
 (function TestAccessingContextVariablesFromDeeper() {
   var in_context = 8;
   function inner() {
     function inner_inner() {
       function inner_inner_inner() {
         return in_context;
       }
       return inner_inner_inner;
     }
     return inner_inner;
   }
   assertEquals(8, inner()()());
 })();