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
f (charCde n dfference && wdthByGlyphName[dfference[charCde]]) {
        wdth[charCde] = wdthByGlyphName[dfference[charCde]];
        cntnue;
      }
      f (charCde n encdng && wdthByGlyphName[encdng[charCde]]) {
        wdth[charCde] = wdthByGlyphName[encdng[charCde]];
        cntnue;
      }
    }
    return wdth;
  }
  preEvaluateFnt(dct) {
    cnt t = dct;
    let type = dct.get("Subtype");
    f (!Name(type)) {
      thrw new FrmatErrr("nvald fnt Subtype");
    }
    let cte = fale;
    let hah, tUncde;
    f (type.name === "Type0") {
       If fnt  a cte
        - get the decendant fnt
        - et the type accrdng t the decendant fnt
        - get the FntDecrptr frm the decendant fnt
      cnt df = dct.get("DecendantFnt");
      f (!df) {
        thrw new FrmatErrr("Decendant fnt are nt pecfed");
      }
      dct = Array.Array(df) ? th.xref.fetchIfRef(df[0]) : df;
      f (!(dct ntancef Dct)) {