[DevTools] Turn ConsoleModel into a singleton

third_party/WebKit/Source/devtools/front_end/bindings/PresentationConsoleMessageHelper.js

 /*
  * Copyright (C) 2012 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 26 matching lines @@
    */
   constructor(workspace) {
     this._workspace = workspace;
 
     /** @type {!Object.<string, !Array.<!SDK.ConsoleMessage>>} */
     this._pendingConsoleMessages = {};
 
     /** @type {!Array.<!Bindings.PresentationConsoleMessage>} */
     this._presentationConsoleMessages = [];
 
-    SDK.multitargetConsoleModel.addEventListener(SDK.ConsoleModel.Events.ConsoleCleared, this._consoleCleared, this);
-    SDK.multitargetConsoleModel.addEventListener(
-        SDK.ConsoleModel.Events.MessageAdded, this._onConsoleMessageAdded, this);
-    SDK.multitargetConsoleModel.messages().forEach(this._consoleMessageAdded, this);
+    SDK.consoleModel.addEventListener(SDK.ConsoleModel.Events.ConsoleCleared, this._consoleCleared, this);
+    SDK.consoleModel.addEventListener(SDK.ConsoleModel.Events.MessageAdded, this._onConsoleMessageAdded, this);
+    SDK.consoleModel.messages().forEach(this._consoleMessageAdded, this);
     // TODO(dgozman): setImmediate because we race with DebuggerWorkspaceBinding on ParsedScriptSource event delivery.
     SDK.targetManager.addModelListener(
         SDK.DebuggerModel, SDK.DebuggerModel.Events.ParsedScriptSource,
         event => setImmediate(this._parsedScriptSource.bind(this, event)));
     SDK.targetManager.addModelListener(
         SDK.DebuggerModel, SDK.DebuggerModel.Events.FailedToParseScriptSource,
         event => setImmediate(this._parsedScriptSource.bind(this, event)));
     SDK.targetManager.addModelListener(
         SDK.DebuggerModel, SDK.DebuggerModel.Events.GlobalObjectCleared, this._debuggerReset, this);
 
@@ skipping 136 matching lines @@
   }
 
   dispose() {
     if (this._uiMessage)
       this._uiMessage.remove();
   }
 };
 
 /** @type {!Bindings.PresentationConsoleMessageHelper} */
 Bindings.presentationConsoleMessageHelper;