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">


const style = element.style;
    style.fontSize = `${this.data.fontSize}px`;
    style.direction = this.data.fontDirection < 0 ? "rtl" : "ltr";
    if (!font) {
      return;
    }
    let bold = "normal";
    if (font.black) {
      bold = "900";
    } else if (font.bold) {
      bold = "bold";
    }
    style.fontWeight = bold;
    style.fontStyle = font.italic ? "italic" : "normal";
    
    const fontFamily = font.loadedName ? `"${font.loadedName}", ` : "";
    const fallbackName = font.fallbackName || "Helvetica, sans-serif";
    style.fontFamily = fontFamily + fallbackName;
  }
}
class CheckboxWidgetAnnotationElement extends WidgetAnnotationElement {