[scoped-custom-element-registry] getName is undefined

### Description

Due to minification during the build process, the getName method is renamed (uglified) and no longer accessible on customElements.

### Example

customElements.getName is undefined

### Steps to reproduce

1. Load the polyfill
2. Try to call customElements.getName

#### Expected behavior

customElements.getName should be a function that returns the name for a previously-defined custom element.

#### Actual behavior

getName is not assigned to customElements

### Version

0.0.9

### Browsers affected

- [x] Chrome

Have not checked the other browsers