Fix TS order of initilization issue around dispose and _register

By overriding _register in this case, we could end up invoking this function on a subclass that had not actually been inited yet (when `_toDispose` has not been set). I believe the overriding was an accident, so the fix is to remove it

src/vs/workbench/contrib/search/browser/searchView.ts

@@ -1699,21 +1699,9 @@ export class SearchView extends ViewletPanel {
 		super.saveState();
 	}
 
-	private _toDispose: IDisposable[] = [];
-	protected _register<T extends IDisposable>(t: T): T {
-		if (this.isDisposed) {
-			console.warn('Registering disposable on object that has already been disposed.');
-			t.dispose();
-		} else {
-			this._toDispose.push(t);
-		}
-		return t;
-	}
-
 	dispose(): void {
 		this.isDisposed = true;
 		this.saveState();
-		this._toDispose = dispose(this._toDispose);
 		super.dispose();
 	}
 }