Revert of [DevTools] Remove edited scripts from debugger agent, move knowledge to frontend.

Source/devtools/front_end/sdk/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 107 matching lines @@
      */
     debuggerEnabled: function()
     {
         return !!this._debuggerEnabled;
     },
 
     enableDebugger: function()
     {
         if (this._debuggerEnabled)
             return;
-        this._agent.enable(this._wasEnabled.bind(this));
+        this._agent.enable();
+        this._debuggerEnabled = true;
         if (this._hasStaleState) {
             this._globalObjectCleared();
             this._hasStaleState = false;
         }
-    },
-
-    /**
-     * @param {?Protocol.Error} error
-     */
-    _wasEnabled: function(error)
-    {
-        if (error)
-            console.error(error);
-        this._debuggerEnabled = true;
         this._pauseOnExceptionStateChanged();
         this.asyncStackTracesStateChanged();
         this.dispatchEventToListeners(WebInspector.DebuggerModel.Events.DebuggerWasEnabled);
     },
 
     disableDebugger: function()
     {
         if (!this._debuggerEnabled)
             return;
 
@@ skipping 1310 matching lines @@
 /**
  * @param {?WebInspector.Target} target
  * @return {?WebInspector.DebuggerModel}
  */
 WebInspector.DebuggerModel.fromTarget = function(target)
 {
     if (!target || !target.hasJSContext())
         return null;
     return /** @type {?WebInspector.DebuggerModel} */ (target.model(WebInspector.DebuggerModel));
 }