[DevTools] Remove remaining usages of global properties.

Source/devtools/front_end/ui/View.js

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2011 Google Inc. All Rights Reserved.
  *
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 372 matching lines @@
      * @param {!Element} element
      */
     setDefaultFocusedElement: function(element)
     {
         this._defaultFocusedElement = element;
     },
 
     focus: function()
     {
         var element = this.defaultFocusedElement();
-        if (!element || element.isAncestor(document.activeElement))
+        if (!element || element.isAncestor(this.element.ownerDocument.activeElement))
             return;
 
         WebInspector.setCurrentFocusElement(element);
     },
 
     /**
      * @return {boolean}
      */
     hasFocus: function()
     {
-        var activeElement = document.activeElement;
+        var activeElement = this.element.ownerDocument.activeElement;
         return activeElement && activeElement.isSelfOrDescendant(this.element);
     },
 
     /**
      * @return {!Size}
      */
     measurePreferredSize: function()
     {
+        var document = this.element.ownerDocument;
         WebInspector.View._originalAppendChild.call(document.body, this.element);
         this.element.positionAt(0, 0);
         var result = new Size(this.element.offsetWidth, this.element.offsetHeight);
         this.element.positionAt(undefined, undefined);
         WebInspector.View._originalRemoveChild.call(document.body, this.element);
         return result;
     },
 
     /**
      * @return {!Constraints}
@@ skipping 221 matching lines @@
 {
     WebInspector.View.__assert(!child.__viewCounter && !child.__view, "Attempt to remove element containing view via regular DOM operation");
     return WebInspector.View._originalRemoveChild.call(this, child);
 }
 
 Element.prototype.removeChildren = function()
 {
     WebInspector.View.__assert(!this.__viewCounter, "Attempt to remove element containing view via regular DOM operation");
     WebInspector.View._originalRemoveChildren.call(this);
 }