[DevTools] Rework some focus code.

third_party/WebKit/Source/devtools/front_end/ui/TextPrompt.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.
@@ skipping 135 matching lines @@
         return this._proxyElement;
     },
 
     detach: function()
     {
         this._removeFromElement();
         this._proxyElement.parentElement.insertBefore(this._element, this._proxyElement);
         this._proxyElement.remove();
         delete this._proxyElement;
         this._element.classList.remove("text-prompt");
-        WebInspector.restoreFocusFromElement(this._element);
+        this._focusRestorer.restore();
     },
 
     /**
      * @return {string}
      */
     text: function()
     {
         return this._element.textContent;
     },
 
@@ skipping 67 matching lines @@
     {
         this._isEditing = true;
         this._contentElement.classList.add("text-prompt-editing");
         if (blurListener) {
             this._blurListener = blurListener;
             this._element.addEventListener("blur", this._blurListener, false);
         }
         this._oldTabIndex = this._element.tabIndex;
         if (this._element.tabIndex < 0)
             this._element.tabIndex = 0;
-        WebInspector.setCurrentFocusElement(this._element);
+        this._focusRestorer = new WebInspector.ElementFocusRestorer(this._element);
         if (!this.text())
             this._updateAutoComplete();
     },
 
     _stopEditing: function()
     {
         this._element.tabIndex = this._oldTabIndex;
         if (this._blurListener)
             this._element.removeEventListener("blur", this._blurListener, false);
         this._contentElement.classList.remove("text-prompt-editing");
@@ skipping 764 matching lines @@
     },
 
     /**
      * @return {string|undefined}
      */
     _currentHistoryItem: function()
     {
         return this._data[this._data.length - this._historyOffset];
     }
 };