DevTools: get rid of getters and setters in StatusBarButton.

Source/devtools/front_end/ui/SplitView.js

Index: Source/devtools/front_end/ui/SplitView.js
diff --git a/Source/devtools/front_end/ui/SplitView.js b/Source/devtools/front_end/ui/SplitView.js
index 543991d3187724f7e6ae284c2c935cc067594ada..b8059ce7a333a3d6df2ad42ab6319c42e883ab59 100644
--- a/Source/devtools/front_end/ui/SplitView.js
+++ b/Source/devtools/front_end/ui/SplitView.js
@@ -875,12 +875,12 @@ WebInspector.SplitView.prototype = {
         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