Fix compile errors related to `toDispose` refactoring

Not sure why incremental builds missed this

src/vs/workbench/contrib/debug/browser/debugToolBar.ts

@@ -81,7 +81,7 @@ export class DebugToolBar extends Themable implements IWorkbenchContribution {
 
 		const actionBarContainer = dom.append(this.$el, dom.$('div.action-bar-container'));
 		this.debugToolBarMenu = menuService.createMenu(MenuId.DebugToolBar, contextKeyService);
-		this.toDispose.push(this.debugToolBarMenu);
+		this._register(this.debugToolBarMenu);
 
 		this.activeActions = [];
 		this.actionBar = this._register(new ActionBar(actionBarContainer, {

src/vs/workbench/contrib/terminal/browser/terminalActions.ts

@@ -748,10 +748,10 @@ export class SwitchTerminalActionViewItem extends SelectActionViewItem {
 	) {
 		super(null, action, terminalService.getTabLabels().map(label => <ISelectOptionItem>{ text: label }), terminalService.activeTabIndex, contextViewService, { ariaLabel: nls.localize('terminals', 'Open Terminals.') });
 
-		this.toDispose.push(terminalService.onInstancesChanged(this._updateItems, this));
-		this.toDispose.push(terminalService.onActiveTabChanged(this._updateItems, this));
-		this.toDispose.push(terminalService.onInstanceTitleChanged(this._updateItems, this));
-		this.toDispose.push(attachSelectBoxStyler(this.selectBox, themeService));
+		this._register(terminalService.onInstancesChanged(this._updateItems, this));
+		this._register(terminalService.onActiveTabChanged(this._updateItems, this));
+		this._register(terminalService.onInstanceTitleChanged(this._updateItems, this));
+		this._register(attachSelectBoxStyler(this.selectBox, themeService));
 	}
 
 	private _updateItems(): void {