Fix minor typo and delete unused import statement.

src/debug/mirrors.js

 // Copyright 2006-2012 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.
 
 (function(global, utils) {
 "use strict";
 
 // ----------------------------------------------------------------------------
 // Imports
 
 var ErrorToString;
 var GlobalArray = global.Array;
 var IsNaN = global.isNaN;
 var JSONStringify = global.JSON.stringify;
 var MakeError;
 var MapEntries;
 var MapIteratorNext;
-var MathMin = global.Math.min;
 var promiseStateSymbol = utils.ImportNow("promise_state_symbol");
 var promiseResultSymbol = utils.ImportNow("promise_result_symbol");
 var SetIteratorNext;
 var SetValues;
 var SymbolToString;
 
 utils.Import(function(from) {
   ErrorToString = from.ErrorToString;
   MakeError = from.MakeError;
   MapEntries = from.MapEntries;
@@ skipping 86 matching lines @@
 
 function ObjectIsPromise(value) {
   return IS_RECEIVER(value) &&
          !IS_UNDEFINED(%DebugGetProperty(value, promiseStateSymbol));
 }
 
 
 /**
  * Returns the mirror for a specified value or object.
  *
- * @param {value or Object} value the value or object to retreive the mirror for
+ * @param {value or Object} value the value or object to retrieve the mirror for
  * @param {boolean} transient indicate whether this object is transient and
  *    should not be added to the mirror cache. The default is not transient.
  * @returns {Mirror} the mirror reflects the passed value or object
  */
 function MakeMirror(value, opt_transient) {
   var mirror;
 
   // Look for non transient mirrors in the mirror cache.
   if (!opt_transient && mirror_cache_enabled_) {
     for (var id in mirror_cache_) {
@@ skipping 2912 matching lines @@
 // Functions needed by the debugger runtime.
 utils.InstallFunctions(utils, DONT_ENUM, [
   "ClearMirrorCache", ClearMirrorCache
 ]);
 
 // Export to debug.js
 utils.Export(function(to) {
   to.MirrorType = MirrorType;
 });
 })