removing drag over listener from drag monitor since we are converting…

… this to drag events

src/vs/workbench/contrib/webview/browser/webviewWindowDragMonitor.ts

@@ -45,14 +45,5 @@ export class WebviewWindowDragMonitor extends Disposable {
 				onDragStart();
 			}
 		}));
-
-		this._register(DOM.addDisposableListener(targetWindow, DOM.EventType.DRAG_OVER, (event) => {
-			if (event.shiftKey) {
-				onDragEnd();
-			} else {
-				onDragStart();
-			}
-		}));
-
 	}
 }