DevTools: bake generic css files into the concatenated one.

Source/devtools/front_end/elementsPanel.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 717 matching lines @@
 .styles-clipboard-only {
     display: inline-block;
     width: 0;
     opacity: 0;
     pointer-events: none;
 }
 
 li.child-editing .styles-clipboard-only {
     display: none;
 }
+
+/* Breadcrumbs */
+
+.crumbs {
+    display: inline-block;
+    pointer-events: auto;
+    cursor: default;
+    font-size: 11px;
+    line-height: 17px;
+}
+
+.crumbs .crumb {
+    display: inline-block;
+    padding: 0 7px;
+    height: 18px;
+    white-space: nowrap;
+}
+
+.crumbs .crumb.collapsed > * {
+    display: none;
+}
+
+.crumbs .crumb.collapsed::before {
+    content: "\2026";
+    font-weight: bold;
+}
+
+.crumbs .crumb.compact .extra {
+    display: none;
+}
+
+.crumbs .crumb.selected, .crumbs .crumb.selected:hover {
+    background-color: rgb(56, 121, 217);
+    color: white;
+    text-shadow: rgba(255, 255, 255, 0.5) 0 0 0;
+}
+
+.crumbs .crumb:hover {
+    background-color: rgb(216, 216, 216);
+}