Remove unused import

src/vs/workbench/browser/layout.ts

@@ -19,7 +19,7 @@ import { IDisposable, dispose } from 'vs/base/common/lifecycle';
 import { IEditorGroupService } from 'vs/workbench/services/group/common/groupService';
 import { getZoomFactor } from 'vs/base/browser/browser';
 import { IThemeService } from 'vs/platform/theme/common/themeService';
-import { isMacintosh, isWindows } from 'vs/base/common/platform';
+import { isMacintosh } from 'vs/base/common/platform';
 import { memoize } from 'vs/base/common/decorators';
 
 const MIN_SIDEBAR_PART_WIDTH = 170;