DevTools: do not clear console when preserving log

third_party/WebKit/Source/devtools/front_end/console_model/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 144 matching lines @@
 
   /**
    * @param {!ConsoleModel.ConsoleMessage} msg
    */
   addMessage(msg) {
     if (msg.source === ConsoleModel.ConsoleMessage.MessageSource.Worker && SDK.targetManager.targetById(msg.workerId))
       return;
 
     if (msg.source === ConsoleModel.ConsoleMessage.MessageSource.ConsoleAPI &&
         msg.type === ConsoleModel.ConsoleMessage.MessageType.Clear)
-      this._clear();
+      this._clearIfNecessary();
 
     this._messages.push(msg);
     var runtimeModel = msg.runtimeModel();
     if (msg._exceptionId && runtimeModel) {
       var modelMap = this._messageByExceptionId.get(runtimeModel);
       if (!modelMap) {
         modelMap = new Map();
         this._messageByExceptionId.set(runtimeModel, modelMap);
       }
       modelMap.set(msg._exceptionId, msg);
@@ skipping 67 matching lines @@
       message = call.args[0].description;
     var callFrame = call.stackTrace && call.stackTrace.callFrames.length ? call.stackTrace.callFrames[0] : null;
     var consoleMessage = new ConsoleModel.ConsoleMessage(
         runtimeModel, ConsoleModel.ConsoleMessage.MessageSource.ConsoleAPI, level,
         /** @type {string} */ (message), call.type, callFrame ? callFrame.url : undefined,
         callFrame ? callFrame.lineNumber : undefined, callFrame ? callFrame.columnNumber : undefined, undefined,
         call.args, call.stackTrace, call.timestamp, call.executionContextId, undefined);
     this.addMessage(consoleMessage);
   }
 
-  /**
-   * @param {!Common.Event} event
-   */
-  _clearIfNecessary(event) {
+  _clearIfNecessary() {
     if (!Common.moduleSetting('preserveConsoleLog').get())
       this._clear();
   }
 
   /**
    * @param {!Common.Event} event
    */
   _mainFrameNavigated(event) {
     if (Common.moduleSetting('preserveConsoleLog').get())
       Common.console.log(Common.UIString('Navigated to %s', event.data.url));
@@ skipping 381 matching lines @@
   Warning: 'warning',
   Error: 'error'
 };
 
 ConsoleModel.ConsoleModel._events = Symbol('ConsoleModel.ConsoleModel.events');
 
 /**
  * @type {!ConsoleModel.ConsoleModel}
  */
 ConsoleModel.consoleModel;