[DevTools] Turn ConsoleModel into a singleton

third_party/WebKit/Source/devtools/front_end/console/ConsolePrompt.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 /**
  * @unrestricted
  */
 Console.ConsolePrompt = class extends UI.Widget {
   constructor() {
     super();
     this._addCompletionsFromHistory = true;
@@ skipping 173 matching lines @@
   }
 
   /**
    * @param {string} text
    * @param {boolean} useCommandLineAPI
    */
   _appendCommand(text, useCommandLineAPI) {
     this.setText('');
     var currentExecutionContext = UI.context.flavor(SDK.ExecutionContext);
     if (currentExecutionContext) {
-      SDK.ConsoleModel.evaluateCommandInConsole(currentExecutionContext, text, useCommandLineAPI);
+      SDK.consoleModel.evaluateCommandInConsole(currentExecutionContext, text, useCommandLineAPI);
       if (Console.ConsolePanel.instance().isShowing())
         Host.userMetrics.actionTaken(Host.UserMetrics.Action.CommandEvaluatedInConsolePanel);
     }
   }
 
   _enterProcessedForTest() {
   }
 
   /**
    * @param {string} prefix
@@ skipping 156 matching lines @@
     return this._currentHistoryItem();
   }
 
   /**
    * @return {string|undefined}
    */
   _currentHistoryItem() {
     return this._data[this._data.length - this._historyOffset];
   }
 };