Attach (recommended) or Link to PDF file here:
https://drive.google.com/open?id=1UjLxnFw2g3gn3tvNLRYLdmG6mFdFKCcr

Configuration:
- Web browser and its version: Chrome 77.0.3865.90
- Operating system and its version: Mac mojave 10.14.6
- PDF.js version: 2.3.194
- Is a browser extension: Nope

Steps to reproduce the problem:
1. Make sure to set `renderInteractiveForms` to `true`
2. The read-only form field(Sample title) doesn't honor it's proper font-size

What is the expected behavior?
<img width="862" alt="write" src="https://user-images.githubusercontent.com/4616548/66152094-4a009a80-e64b-11e9-81dc-178068055efa.png">

What went wrong?
<img width="842" alt="wrong" src="https://user-images.githubusercontent.com/4616548/66152100-4d942180-e64b-11e9-91a8-ad9caf451f98.png">


if (!isName(style)) {
      return;
    }
    switch (style.name) {
      case "S":
        this.style = AnnotationBorderStyleType.SOLID;
        break;
      case "D":
        this.style = AnnotationBorderStyleType.DASHED;
        break;
      case "B":
        this.style = AnnotationBorderStyleType.BEVELED;
        break;
      case "I":
        this.style = AnnotationBorderStyleType.INSET;
        break;
      case "U":
        this.style = AnnotationBorderStyleType.UNDERLINE;
        break;
      default:
        break;
    }
  }