DevTools: Nuke timeline frame overview

Source/devtools/front_end/timeline/timelinePanel.css

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Anthony Ricaud <rik@webkit.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 41 matching lines @@
 }
 
 .timeline-records-list {
     flex: auto;
 }
 
 #timeline-overview-grid {
     background-color: rgb(255, 255, 255);
 }
 
-.timeline-overview-frames-mode #timeline-overview-grid,
-.timeline-overview-frames-mode .overview-grid-cursor-area,
-.timeline-overview-frames-mode .overview-grid-cursor-position {
-    display: none;
-}
-
 #timeline-overview-grid .resources-dividers-label-bar {
     pointer-events: auto;
 }
 
-.timeline-overview-frames-mode .overview-grid-window,
-.timeline-overview-frames-mode .overview-grid-dividers-background {
-    height: 100%;
-}
-
 #timeline-container {
     border-right: 0 none transparent;
     overflow-y: scroll;
     overflow-x: hidden;
 }
 
 .timeline-details-split {
     flex: auto;
 }
 
@@ skipping 225 matching lines @@
 
 #timeline-overview-responsiveness {
     flex-basis: 6px;
     margin-top: 1px !important;
 }
 
 #timeline-overview-input {
     flex-basis: 6px;
 }
 
-#timeline-overview-frames {
-    flex-basis: 100px;
-}
-
 #timeline-overview-pane {
     flex: auto;
     position: relative;
     overflow: hidden;
 }
 
 #timeline-overview-container {
     display: flex;
     flex-direction: column;
     flex: none;
     position: relative;
     overflow: hidden;
 }
 
 #timeline-overview-container canvas {
     width: 100%;
     height: 100%;
 }
 
-#timeline-overview-frames canvas {
-    z-index: 200;
-    opacity: 0.8;
-    background-color: rgb(255, 255, 255);
-}
-
 #timeline-graphs {
     position: absolute;
     left: 0;
     right: 0;
     max-height: 100%;
     top: 20px;
 }
 
 .timeline-graph-side {
     position: relative;
@@ skipping 688 matching lines @@
     float: right;
     height: 15px;
     background-color: hsla(43, 84%, 64%, 0.2);
     border-bottom: 1px solid hsl(43, 84%, 64%);
 }
 
 .timeline-tree-view .data-grid .selected .background-bar {
     background-color: rgba(255, 255, 255, 0.25);
     border-bottom-color: transparent;
 }