Revert of Fix UI glitches on Performance and Memory panels

third_party/WebKit/Source/devtools/front_end/timeline/TimelinePanel.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel 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.
@@ skipping 87 matching lines @@
         PerfUI.TimelineOverviewPane.Events.WindowChanged, this._onWindowChanged.bind(this));
     this._overviewPane.show(topPaneElement);
     this._statusPaneContainer = this._timelinePane.element.createChild('div', 'status-pane-container fill');
 
     this._createFileSelector();
 
     SDK.targetManager.addEventListener(SDK.TargetManager.Events.PageReloadRequested, this._pageReloadRequested, this);
     SDK.targetManager.addEventListener(SDK.TargetManager.Events.Load, this._loadEventFired, this);
 
     // Create top level properties splitter.
-    this._detailsSplitWidget = new UI.SplitWidget(false, true, 'timelinePanelDetailsSplitViewState', 400);
+    this._detailsSplitWidget = new UI.SplitWidget(false, true, 'timelinePanelDetailsSplitViewState');
     this._detailsSplitWidget.element.classList.add('timeline-details-split');
     this._detailsView =
         new Timeline.TimelineDetailsView(this._model, this._frameModel, this._filmStripModel, this._filters, this);
     this._detailsSplitWidget.installResizer(this._detailsView.headerElement());
     this._detailsSplitWidget.setSidebarWidget(this._detailsView);
 
     this._searchableView = new UI.SearchableView(this);
     this._searchableView.setMinimumSize(0, 100);
     this._searchableView.element.classList.add('searchable-view');
     this._detailsSplitWidget.setMainWidget(this._searchableView);
@@ skipping 1576 matching lines @@
 };
 
 Timeline.TimelinePanel._traceProviderSettingSymbol = Symbol('traceProviderSetting');
 
 /** @enum {symbol} */
 Timeline.TimelineFilters.Events = {
   FilterChanged: Symbol('FilterChanged')
 };
 
 Timeline.TimelineFilters._durationFilterPresetsMs = [0, 1, 15];