src/vs/editor/browser/services/abstractCodeEditorService.ts/AbstractCodeEditorService/removeDecorationType
class AbstractCodeEditorService:	public removeDecorationType(key: string): void {
		const provider = this._decorationOptionProviders.get(key);
		if (provider) {
			provider.refCount--;
			if (provider.refCount <= 0) {
				this._decorationOptionProviders.delete(key);
				provider.dispose();
				this.listCodeEditors().forEach((ed) => ed.removeDecorationsByType(key));
			}
		}
	}