DevTools: Simplify timeline events 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 256 matching lines @@
 
 #timeline-overview-network {
     flex-basis: 39px;
 }
 
 #timeline-overview-memory {
     flex-basis: 20px;
 }
 
 #timeline-overview-frames {
-    flex-basis: 120px;
+    flex-basis: 102px;
 }
 
 #timeline-overview-pane {
     flex: auto;
     position: relative;
     overflow: hidden;
 }
 
 #timeline-overview-container {
     display: flex;
@@ skipping 591 matching lines @@
     cursor: pointer;
 }
 
 .timeline-overview-popover .frame .time {
     display: none;
 }
 
 .timeline-overview-popover .frame .thumbnail img {
     max-width: 200px;
 }