[DevTools] Get rid of floats in treeoutline.

third_party/WebKit/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 186 matching lines @@
 
 ol.outline-disclosure:focus li.selected {
     color: white;
 }
 
 ol.outline-disclosure:focus li.selected * {
     color: inherit;
 }
 
 .outline-disclosure li::before {
-    float: left;
     -webkit-user-select: none;
     -webkit-mask-image: url(Images/toolbarButtonGlyphs.png);
     -webkit-mask-size: 352px 168px;
-    content: "a";
+    content: "aa";
     color: transparent;
     text-shadow: none;
-    position: relative;
-    top: 2px;
-    margin-right: 1px;
-    width: 10px;
-    height: 10px;
+    margin-right: -2px;
 }
 
 .outline-disclosure li:not(.parent)::before {
     background-color: transparent;
 }
 
 @media (-webkit-min-device-pixel-ratio: 1.5) {
 .outline-disclosure li::before {
     -webkit-mask-image: url(Images/toolbarButtonGlyphs_2x.png);
 }
@@ skipping 325 matching lines @@
     bottom: 0;
 }
 
 .viewport-control-gap-element {
     color: transparent;
 }
 
 .drawer-toolbar {
     margin-right: -6px;
 }