[DevTools] Do not register log dispatcher

third_party/WebKit/Source/devtools/front_end/sdk/ConsoleModel.js

 /*
  * Copyright (C) 2011 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 27 matching lines @@
 {
     WebInspector.SDKModel.call(this, WebInspector.ConsoleModel, target);
 
     /** @type {!Array.<!WebInspector.ConsoleMessage>} */
     this._messages = [];
     /** @type {!Map<number, !WebInspector.ConsoleMessage>} */
     this._messageByExceptionId = new Map();
     this._warnings = 0;
     this._errors = 0;
     this._revokedErrors = 0;
-    target.registerLogDispatcher(new WebInspector.LogDispatcher(this));
     this._logAgent = logAgent;
-    this._logAgent && this._logAgent.enable();
+    if (this._logAgent) {
+        target.registerLogDispatcher(new WebInspector.LogDispatcher(this));
+        this._logAgent.enable();
+    }
 }
 
 /** @enum {symbol} */
 WebInspector.ConsoleModel.Events = {
     ConsoleCleared: Symbol("ConsoleCleared"),
     MessageAdded: Symbol("MessageAdded"),
     MessageUpdated: Symbol("MessageUpdated"),
     CommandEvaluated: Symbol("CommandEvaluated")
 }
 
@@ skipping 597 matching lines @@
         this.dispatchEventToListeners(WebInspector.ConsoleModel.Events.CommandEvaluated, event.data);
     },
 
     __proto__: WebInspector.Object.prototype
 }
 
 /**
  * @type {!WebInspector.MultitargetConsoleModel}
  */
 WebInspector.multitargetConsoleModel;