DevTools: Remove LiveEditSupport.ScriptFile as it is not really needed.

Source/devtools/front_end/DebuggerModel.js

 /*
  * Copyright (C) 2010 Google 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
@@ skipping 252 matching lines @@
 
         var target = this.target();
         /**
          * @param {?Protocol.Error} error
          * @param {!DebuggerAgent.BreakpointId} breakpointId
          * @param {!Array.<!DebuggerAgent.Location>} locations
          */
         function didSetBreakpoint(error, breakpointId, locations)
         {
             if (callback) {
-                var rawLocations = locations.map(WebInspector.DebuggerModel.Location.fromPayload.bind(WebInspector.DebuggerModel.Location, target));
+                var rawLocations = locations ? locations.map(WebInspector.DebuggerModel.Location.fromPayload.bind(WebInspector.DebuggerModel.Location, target)) : [];
                 callback(error ? null : breakpointId, rawLocations);
             }
         }
         this._agent.setBreakpointByUrl(lineNumber, url, undefined, columnNumber, condition, undefined, didSetBreakpoint);
         WebInspector.userMetrics.ScriptsBreakpointSet.record();
     },
 
     /**
      * @param {!WebInspector.DebuggerModel.Location} rawLocation
      * @param {string} condition
@@ skipping 837 matching lines @@
             this.asyncStackTrace.dispose();
     },
 
     __proto__: WebInspector.TargetAware.prototype
 }
 
 /**
  * @type {!WebInspector.DebuggerModel}
  */
 WebInspector.debuggerModel;