DevTools: cleanup button styles

third_party/WebKit/Source/devtools/front_end/perf_ui/FilmStripView.js

 // Copyright 2015 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
  */
 PerfUI.FilmStripView = class extends UI.HBox {
   constructor() {
     super(true);
     this.registerRequiredCSS('perf_ui/filmStripView.css');
@@ skipping 205 matching lines @@
     this.contentElement.classList.add('filmstrip-dialog');
     this.contentElement.tabIndex = 0;
 
     this._frames = filmStripFrame.model().frames();
     this._index = filmStripFrame.index;
     this._zeroTime = zeroTime || filmStripFrame.model().zeroTime();
 
     this._imageElement = this.contentElement.createChild('img');
     var footerElement = this.contentElement.createChild('div', 'filmstrip-dialog-footer');
     footerElement.createChild('div', 'flex-auto');
-    var prevButton =
-        UI.createTextButton('\u25C0', this._onPrevFrame.bind(this), undefined, Common.UIString('Previous frame'));
+    var prevButton = UI.createTextButton('\u25C0', this._onPrevFrame.bind(this));
+    prevButton.title = Common.UIString('Previous frame');
     footerElement.appendChild(prevButton);
     this._timeLabel = footerElement.createChild('div', 'filmstrip-dialog-label');
-    var nextButton =
-        UI.createTextButton('\u25B6', this._onNextFrame.bind(this), undefined, Common.UIString('Next frame'));
+    var nextButton = UI.createTextButton('\u25B6', this._onNextFrame.bind(this));
+    nextButton.title = Common.UIString('Next frame');
     footerElement.appendChild(nextButton);
     footerElement.createChild('div', 'flex-auto');
 
     this.contentElement.addEventListener('keydown', this._keyDown.bind(this), false);
     this.setDefaultFocusedElement(this.contentElement);
     this._render();
   }
 
   _resize() {
     if (!this._dialog) {
@@ skipping 59 matching lines @@
    * @return {!Promise<undefined>}
    */
   _render() {
     var frame = this._frames[this._index];
     this._timeLabel.textContent = Number.millisToString(frame.timestamp - this._zeroTime);
     return frame.imageDataPromise()
         .then(PerfUI.FilmStripView._setImageData.bind(null, this._imageElement))
         .then(this._resize.bind(this));
   }
 };