DevTools: remove scroller from timeline details view

third_party/WebKit/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 311 matching lines @@
     overflow: hidden;
 }
 
 .timeline-details-view-body {
     flex: auto;
     overflow: auto;
     position: relative;
     background-color: #f3f3f3;
 }
 
+.timeline-details-view-body > div {
+    overflow: hidden;
+}
+
 .timeline-details-view-block {
     flex: none;
     display: flex;
     background-color: white;
     flex-direction: column;
     padding-bottom: 5px;
     border-bottom: 1px solid #ccc;
 }
 
 .timeline-details-view-row {
@@ skipping 265 matching lines @@
 .timeline-tree-view .data-grid th {
     border-bottom: 1px solid #ddd;
     background-color: #f3f3f3
 }
 
 .timeline-stack-view-header {
     height: 26px;
     background-color: white;
     padding: 6px 10px;
     color: #5a5a5a;
+    white-space: nowrap;
 }