DevTools: get rid of getters and setters in StatusBarButton.

Source/devtools/front_end/ui/SplitView.js

 /*
  * Copyright (C) 2012 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 857 matching lines @@
         }
 
         return this._showHideSidebarButton;
     },
 
     _updateShowHideSidebarButton: function()
     {
         if (!this._showHideSidebarButton)
             return;
         var sidebarHidden = this._showMode === WebInspector.SplitView.ShowMode.OnlyMain;
-        this._showHideSidebarButton.state = sidebarHidden ? "show" : "hide";
+        this._showHideSidebarButton.setState(sidebarHidden ? "show" : "hide");
         this._showHideSidebarButton.element.classList.toggle("top-sidebar-show-hide-button", !this.isVertical() && !this.isSidebarSecond());
         this._showHideSidebarButton.element.classList.toggle("right-sidebar-show-hide-button", this.isVertical() && this.isSidebarSecond());
         this._showHideSidebarButton.element.classList.toggle("bottom-sidebar-show-hide-button", !this.isVertical() && this.isSidebarSecond());
         this._showHideSidebarButton.element.classList.toggle("left-sidebar-show-hide-button", this.isVertical() && !this.isSidebarSecond());
-        this._showHideSidebarButton.title = sidebarHidden ? WebInspector.UIString("Show %s", this._showHideSidebarButtonTitle) : WebInspector.UIString("Hide %s", this._showHideSidebarButtonTitle);
+        this._showHideSidebarButton.setTitle(sidebarHidden ? WebInspector.UIString("Show %s", this._showHideSidebarButtonTitle) : WebInspector.UIString("Hide %s", this._showHideSidebarButtonTitle));
     },
 
     __proto__: WebInspector.View.prototype
 }