DevTools: get rid of getters and setters in StatusBarButton.

Source/devtools/front_end/resources/CookieItemsView.js

Index: Source/devtools/front_end/resources/CookieItemsView.js
diff --git a/Source/devtools/front_end/resources/CookieItemsView.js b/Source/devtools/front_end/resources/CookieItemsView.js
index 8cfdcfd9e5e15a4b7457177e62c85dd243dd7c5b..b48b20b1b0ff660f2629dcb7261d8aee51ca5bb2 100644
--- a/Source/devtools/front_end/resources/CookieItemsView.js
+++ b/Source/devtools/front_end/resources/CookieItemsView.js
@@ -38,11 +38,11 @@ WebInspector.CookieItemsView = function(treeElement, cookieDomain)
     this.element.classList.add("storage-view");
 
     this._deleteButton = new WebInspector.StatusBarButton(WebInspector.UIString("Delete"), "delete-storage-status-bar-item");
-    this._deleteButton.visible = false;
+    this._deleteButton.setVisible(false);
     this._deleteButton.addEventListener("click", this._deleteButtonClicked, this);
 
     this._clearButton = new WebInspector.StatusBarButton(WebInspector.UIString("Clear"), "clear-storage-status-bar-item");
-    this._clearButton.visible = false;
+    this._clearButton.setVisible(false);
     this._clearButton.addEventListener("click", this._clearButtonClicked, this);
 
     this._refreshButton = new WebInspector.StatusBarButton(WebInspector.UIString("Refresh"), "refresh-storage-status-bar-item");
@@ -70,7 +70,7 @@ WebInspector.CookieItemsView.prototype = {
 
     willHide: function()
     {
-        this._deleteButton.visible = false;
+        this._deleteButton.setVisible(false);
     },
 
     _update: function()
@@ -88,8 +88,8 @@ WebInspector.CookieItemsView.prototype = {
         if (!this._cookies.length) {
             // Nothing to show.
             this._emptyView.show(this.element);
-            this._clearButton.visible = false;
-            this._deleteButton.visible = false;
+            this._clearButton.setVisible(false);
+            this._deleteButton.setVisible(false);
             if (this._cookiesTable)
                 this._cookiesTable.detach();
             return;
@@ -103,8 +103,8 @@ WebInspector.CookieItemsView.prototype = {
         this._cookiesTable.show(this.element);
         this._treeElement.subtitle = String.sprintf(WebInspector.UIString("%d cookies (%s)"), this._cookies.length,
             Number.bytesToString(this._totalSize));
-        this._clearButton.visible = true;
-        this._deleteButton.visible = !!this._cookiesTable.selectedCookie();
+        this._clearButton.setVisible(true);
+        this._deleteButton.setVisible(!!this._cookiesTable.selectedCookie());
     },
 
     /**
@@ -157,7 +157,7 @@ WebInspector.CookieItemsView.prototype = {
 
     _showDeleteButton: function()
     {
-        this._deleteButton.visible = true;
+        this._deleteButton.setVisible(true);
     },
 
     _deleteButtonClicked: function()