[DevTools] Improve UX of timeline column sort in Network panel.

Source/devtools/front_end/network/networkLogView.css

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 92 matching lines @@
 }
 
 .network-log-grid.data-grid .name-column {
     cursor: pointer;
 }
 
 .network-log-grid.data-grid .timeline-column {
     padding: 1px 0;
 }
 
+.network-log-grid.data-grid .timeline-column .sort-order-icon-container {
+    right: 15px;
+    pointer-events: none;
+}
+
 #network-container:not(.brief-mode) .network-log-grid.data-grid td.name-column:hover {
     text-decoration: underline;
 }
 
 .network-log-grid.data-grid.small .network-graph-side {
     height: 19px;
 }
 
 .network-log-grid.data-grid th.sortable:active {
     background-image: none !important;
@@ skipping 475 matching lines @@
 
 #network-container {
     overflow-y: auto;
     overflow-x: hidden;
 }
 
 /* Brief mode peculiarities. */
 #network-container.brief-mode .network-timeline-grid {
     display: none;
 }