Remove inessential functions from the JS Script class

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
 
@@ skipping 2338 matching lines @@
   return this.script_.type;
 };
 
 
 ScriptMirror.prototype.compilationType = function() {
   return this.script_.compilation_type;
 };
 
 
 ScriptMirror.prototype.lineCount = function() {
-  return this.script_.lineCount();
+  return %ScriptLineCount(this.script_);
 };
 
 
 ScriptMirror.prototype.locationFromPosition = function(
     position, include_resource_offset) {
   return this.script_.locationFromPosition(position, include_resource_offset);
 };
 
 
-ScriptMirror.prototype.sourceSlice = function (opt_from_line, opt_to_line) {
-  return this.script_.sourceSlice(opt_from_line, opt_to_line);
-};
-
-
 ScriptMirror.prototype.context = function() {
   return this.context_;
 };
 
 
 ScriptMirror.prototype.evalFromScript = function() {
   return MakeMirror(this.script_.eval_from_script);
 };
 
 
@@ skipping 656 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;
 });
 })