[DevTools] Get rid of floats in treeoutline.

third_party/WebKit/Source/devtools/front_end/ui/treeoutline.css

 /*
  * Copyright 2015 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 .tree-outline {
     padding: 0 0 4px 4px;
     margin: 0;
     z-index: 0;
@@ skipping 47 matching lines @@
     padding: 0;
 }
 
 .tree-outline ol {
     padding-left: 12px;
 }
 
 .tree-outline li {
     text-overflow: ellipsis;
     white-space: nowrap;
-    overflow: hidden;
     min-height: 17px;
     padding-top: 2px;
     position: relative;
 }
 
 ol.tree-outline:focus li.selected {
     color: white;
 }
 
 ol.tree-outline:focus li.selected * {
     color: inherit;
 }
 
 .tree-outline 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;
-    margin-right: 1px;
-    top: 1px;
-    width: 10px;
-    height: 10px;
+    margin-right: -2px;
+    height: 12px;
 }
 
 .tree-outline li:not(.parent)::before {
     background-color: transparent;
 }
 
 @media (-webkit-min-device-pixel-ratio: 1.5) {
 .tree-outline li::before {
     -webkit-mask-image: url(Images/toolbarButtonGlyphs_2x.png);
 }
 } /* media */
 
 .tree-outline li::before {
     -webkit-mask-position: -4px -96px;
     background-color: rgb(110, 110, 110);
 }
 
 .tree-outline li.parent.expanded::before {
     -webkit-mask-position: -20px -96px;
 }
 
 .tree-outline ol.children {
     display: none;
 }
 
 .tree-outline ol.children.expanded {
     display: block;
 }