[DevTools] Get rid of floats in treeoutline.

third_party/WebKit/Source/devtools/front_end/sources/WatchExpressionsSidebarPane.js

 /*
  * Copyright (C) IBM Corp. 2009  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 338 matching lines @@
         } else {
             this._valueElement = WebInspector.ObjectPropertiesSection.createValueElementWithCustomSupport(result, wasThrown, titleElement);
         }
         var separatorElement = createElementWithClass("span", "watch-expressions-separator");
         separatorElement.textContent = ": ";
         titleElement.appendChildren(this._nameElement, separatorElement, this._valueElement);
 
         this._element.removeChildren();
         this._objectPropertiesSection = null;
         if (!wasThrown && result && result.hasChildren && !result.customPreview()) {
+            headerElement.classList.add("watch-expression-object-header");
             this._objectPropertiesSection = new WebInspector.ObjectPropertiesSection(result, headerElement);
             this._objectPresentationElement = this._objectPropertiesSection.element;
             var objectTreeElement = this._objectPropertiesSection.objectTreeElement();
             objectTreeElement.toggleOnClick = false;
             objectTreeElement.listItemElement.addEventListener("click", this._onSectionClick.bind(this), false);
             objectTreeElement.listItemElement.addEventListener("dblclick", this._dblClickOnWatchExpression.bind(this));
         } else {
             this._objectPresentationElement = headerElement;
             this._objectPresentationElement.addEventListener("dblclick", this._dblClickOnWatchExpression.bind(this));
         }
@@ skipping 55 matching lines @@
             contextMenu.appendApplicableItems(this._result);
     },
 
     _copyValueButtonClicked: function()
     {
         InspectorFrontendHost.copyText(this._valueElement.textContent);
     },
 
     __proto__: WebInspector.Object.prototype
 }