DevTools: [Regression] Callstack frames do not have stripes anymore.

Source/devtools/front_end/inspectorStyle.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 1395 matching lines @@
     display: block;
 }
 
 .placard {
     position: relative;
     padding: 3px 8px 4px 18px;
     min-height: 18px;
     white-space: nowrap;
 }
 
+.placard:nth-of-type(2n) {
+    background-color: rgb(234, 243, 255);
+}
+
 .placard.selected {
     background-color: rgb(212, 212, 212);
     background-clip: padding-box;
 }
 
 .placard .title {
     font-weight: normal;
     word-wrap: break-word;
     white-space: normal;
 }
@@ skipping 1344 matching lines @@
 }
 
 body.inactive select.chrome-select,
 .chrome-select:disabled {
     background-image: -webkit-image-set(url(Images/chromeDisabledSelect.png) 1x, url(Images/chromeDisabledSelect_2x.png) 2x), linear-gradient(#f1f1f1, #f1f1f1 38%, #e6e6e6);
     border-color: rgba(80, 80, 80, 0.2);
     box-shadow: 0 1px 0 rgba(80, 80, 80, 0.08),
     inset 0 1px 2px rgba(255, 255, 255, 0.75);
     color: #aaa;
 }