[DevTools] Get rid of floats in treeoutline.

third_party/WebKit/Source/devtools/front_end/sources/sourcesPanel.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 156 matching lines @@
 }
 
 .watch-expression-title {
     white-space: nowrap;
     text-overflow: ellipsis;
     overflow: hidden;
     line-height: 12px;
     margin-left: 11px;
 }
 
+.watch-expression-object-header .watch-expression-title {
+    margin-left: 1px;
+}
+
 .watch-expression {
     position: relative;
     padding: 1px 0px 1px 6px;
+    flex: none;
 }
 
 .watch-expressions .name {
     color: rgb(136, 19, 145);
     flex: none;
     white-space: nowrap;
     text-overflow: ellipsis ;
     overflow: hidden;
 }
 
@@ skipping 11 matching lines @@
     overflow: hidden;
     white-space: nowrap;
     padding-left: 4px;
     -webkit-user-select: text;
 }
 
 .watch-expression-text-prompt-proxy {
     margin-left: 12px;
 }
 
+.watch-expression-header {
+    flex: auto;
+}
+
+.watch-expression-object-header {
+    margin-left: -12px;
+    padding-left: 12px;
+}
+
 .watch-expression-header:hover {
     background-color: #F0F0F0;
     padding-right: 14px;
 }
 
 .sidebar-pane-stack .watch-expressions {
     margin-top: 0px;
 }
 
+.scope-chain-sidebar-pane-section-header {
+    flex: auto;
+}
+
 .scope-chain-sidebar-pane-section-subtitle {
     float: right;
     margin-left: 5px;
     max-width: 55%;
     text-overflow: ellipsis;
     overflow: hidden;
 }
 
 .scope-chain-sidebar-pane-section-title {
     font-weight: normal;
@@ skipping 15 matching lines @@
 
 .scope-chain-sidebar-pane-section-title {
     font-weight: normal;
     word-wrap: break-word;
     white-space: normal;
 }
 
 .scope-chain-sidebar-pane-section {
     padding: 2px 4px 2px 4px;
 }