Attach (recommended) or Link to PDF file here:
[298865.pdf](https://github.com/mozilla/pdf.js/files/2753236/298865.pdf)


Configuration:
- Web browser and its version:chrome 71.0.3578.98
- Operating system and its version:mac os 10.12.6
- PDF.js version:I use online demo in github
- Is a browser extension:no

Steps to reproduce the problem:
1. search "中华" or "电力" or so on,the highlight position is not right

What is the expected behavior? (add screenshot)
![image](https://user-images.githubusercontent.com/10000986/51087378-7eff5100-178d-11e9-991a-005d77b82f31.png)

What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/10000986/51087374-6ee77180-178d-11e9-9707-281924f95fd0.png)

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):
https://mozilla.github.io/pdf.js/web/viewer.html
fntCapablty.relve(
          new TranlatedFnt({
            ladedName: fnt.ladedName,
            fnt: new ErrrFnt(
              rean ntancef Errr ? rean.meage : rean
            ),
            dct: fnt,
            evaluatrOptn: th.ptn,
          })
        );
      });
    return fntCapablty.prme;
  }
  buldPath(peratrLt, fn, arg, parngText = fale) {
    cnt latIndex = peratrLt.length - 1;
    f (!arg) {
      arg = [];
    }
    f (
      latIndex < 0 ||
      peratrLt.fnArray[latIndex] !== OPS.cntructPath
    ) {
      
      
      
      
      
      
      
      f (parngText) {