Do not wrap text in the flakiness dashboard revision popup

Tools/TestResultServer/static-dashboards/flakiness_dashboard_tests.css

 /*
  * Copyright (C) 2012 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 159 matching lines @@
 #popup {
     background-color: white;
     z-index: 1;
     position: absolute;
     border: 3px solid grey;
     padding: 3px;
     -webkit-box-shadow: 5px 5px 5px rgba(0, 0, 0, 0.5);
     -moz-box-shadow: 5px 5px 5px rgba(0, 0, 0, 0.5);
     -webkit-border-radius: 5px;
     -moz-border-radius: 5px;
+    white-space: nowrap;
 }
 #popup > ul {
     margin: 0;
     padding-left: 20px;
 }
 .expectations-container {
     overflow: hidden;
     margin-bottom: 10px;
 }
 .expectations-item {
@@ skipping 62 matching lines @@
     display: inline-block;
     white-space: nowrap;
 }
 .skipped-builder:after {
     content: '|';
     margin: 5px;
 }
 .skipped-builder:last-child:after {
     content: '';
 }