[DevTools] Rename View to Widget.

Source/devtools/front_end/elements/animationTimeline.css

 /*
  * Copyright (c) 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.
  */
 
 .animation-node-row {
     width: 100%;
     display: flex;
     border-bottom: 1px dashed #ccc;
@@ skipping 95 matching lines @@
 }
 
 .animation-time-overlay {
     background-color: black;
     opacity: 0.05;
     position: absolute;
     height: 100%;
     width: 100%;
 }
 
-.view.component-root.platform-linux.vbox {
+.widget.component-root.platform-linux.vbox {
     overflow: hidden;
 }
 
 input.animation-playback-slider {
     float: right;
     width: 63px;
     margin-right: 8px;
 }
 
 .animation-playback-label {
@@ skipping 146 matching lines @@
 
 .animation-keyframe-step line {
     stroke-width: 2;
     stroke-opacity: 0.3;
 }
 
 text.animation-timeline-grid-label {
     font-size: 10px;
     fill: #999;
 }