DevTools: Move jsdifflib to "sources", extract "toolbox" module

Source/devtools/front_end/sources/jsdifflib.js

 /*
  * This is part of jsdifflib v1.0. <http://snowtide.com/jsdifflib>
  *
  * Copyright (c) 2007, Snowtide Informatics Systems, Inc.
  * All rights reserved.
- * 
+ *
  * Redistribution and use in source and binary forms, with or without modification,
  * are permitted provided that the following conditions are met:
- * 
+ *
  *    * Redistributions of source code must retain the above copyright notice, this
  * list of conditions and the following disclaimer.
  *    * Redistributions in binary form must reproduce the above copyright notice,
  * this list of conditions and the following disclaimer in the documentation
  * and/or other materials provided with the distribution.
  *    * Neither the name of the Snowtide Informatics Systems nor the names of its
  * contributors may be used to endorse or promote products derived from this
  * software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
@@ skipping 69 matching lines @@
     // returns a function that returns true if a key passed to the returned function
     // is in the dict (js object) provided to this function; replaces being able to
     // carry around dict.has_key in python...
     __isindict: function (dict) {
         return function (key) { return dict.hasOwnProperty(key); };
     },
 
     // replacement for python's dict.get function -- need easy default values
     __dictget: function (dict, key, defaultValue) {
         return dict.hasOwnProperty(key) ? dict[key] : defaultValue;
-    },  
+    },
 
     SequenceMatcher: function (a, b, isjunk) {
         this.set_seqs = function (a, b) {
             this.set_seq1(a);
             this.set_seq2(b);
         }
 
         this.set_seq1 = function (a) {
             if (a == this.a) return;
             this.a = a;
@@ skipping 290 matching lines @@
             var la = this.a.length;
             var lb = this.b.length;
             return _calculate_ratio(Math.min(la, lb), la + lb);
         }
 
         this.isjunk = isjunk ? isjunk : difflib.defaultJunkFunction;
         this.a = this.b = null;
         this.set_seqs(a, b);
     }
 }