proper check for WCO (microsoft#165384)

fixes microsoft#165337

Author: sbatten

src/vs/workbench/electron-sandbox/parts/titlebar/titlebarPart.ts

@@ -3,7 +3,7 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-import { getZoomFactor } from 'vs/base/browser/browser';
+import { getZoomFactor, isWCOVisible } from 'vs/base/browser/browser';
 import { $, addDisposableListener, append, EventType, hide, show } from 'vs/base/browser/dom';
 import { IContextKeyService } from 'vs/platform/contextkey/common/contextkey';
 import { IConfigurationService, IConfigurationChangeEvent } from 'vs/platform/configuration/common/configuration';
@@ -165,8 +165,7 @@ export class TitlebarPart extends BrowserTitleBarPart {
 		}
 
 		// Window Controls (Native Windows/Linux)
-		const hasWindowControlsOverlay = typeof (navigator as any).windowControlsOverlay !== 'undefined';
-		if (!isMacintosh && getTitleBarStyle(this.configurationService) !== 'native' && !hasWindowControlsOverlay && this.windowControls) {
+		if (!isMacintosh && getTitleBarStyle(this.configurationService) !== 'native' && !isWCOVisible() && this.windowControls) {
 			// Minimize
 			const minimizeIcon = append(this.windowControls, $('div.window-icon.window-minimize' + Codicon.chromeMinimize.cssSelector));
 			this._register(addDisposableListener(minimizeIcon, EventType.CLICK, e => {