DevTools: Change default timeline overview mode to events.

Source/devtools/front_end/common/Settings.js

 /*
  * Copyright (C) 2009 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 315 matching lines @@
 }
 
 /**
  * @constructor
  */
 WebInspector.VersionController = function()
 {
 }
 
 WebInspector.VersionController._currentVersionName = "inspectorVersion";
-WebInspector.VersionController.currentVersion = 12;
+WebInspector.VersionController.currentVersion = 13;
 
 WebInspector.VersionController.prototype = {
     updateVersion: function()
     {
         var localStorageVersion = window.localStorage ? window.localStorage[WebInspector.VersionController._currentVersionName] : 0;
         var versionSetting = WebInspector.settings.createSetting(WebInspector.VersionController._currentVersionName, 0);
         var currentVersion = WebInspector.VersionController.currentVersion;
         // While localStorage version exists, treat it as the main one. It'll be erased once migrated to prefs.
         var oldVersion = parseInt(localStorageVersion || "0", 10) || versionSetting.get();
         if (oldVersion === 0) {
@@ skipping 227 matching lines @@
 
         for (var key in window.localStorage) {
             if (key in localSettings)
                 continue;
             var value = window.localStorage[key];
             window.localStorage.removeItem(key);
             WebInspector.settings._settingsStorage[key] = value;
         }
     },
 
+    _updateVersionFrom12To13: function()
+    {
+        WebInspector.settings.createSetting("timelineOverviewMode", "").remove();
+    },
+
     /**
      * @param {!WebInspector.Setting} breakpointsSetting
      * @param {number} maxBreakpointsCount
      */
     _clearBreakpointsWhenTooMany: function(breakpointsSetting, maxBreakpointsCount)
     {
         // If there are too many breakpoints in a storage, it is likely due to a recent bug that caused
         // periodical breakpoints duplication leading to inspector slowness.
         if (breakpointsSetting.get().length > maxBreakpointsCount)
             breakpointsSetting.set([]);
@@ skipping 15 matching lines @@
 }
 
 /**
  * @param {string} settingName
  * @return {!WebInspector.Setting}
  */
 WebInspector.settingForTest = function(settingName)
 {
     return WebInspector.settings.settingForTest(settingName);
 }