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
wtch (peratr.name) {
      cae "And":
      cae "Or":
      cae "Nt":
        currentReult.puh(peratr.name);
        break;
      default:
        warn(`Invald peratr ${peratr.name} n vblty expren`);
        return;
    }
    fr (let  = 1;  < length; ) {
      cnt raw = array[];
      cnt bject = th.xref.fetchIfRef(raw);
      f (Array.Array(bject)) {
        cnt netedReult = [];
        currentReult.puh(netedReult);
        
        th._pareVbltyExpren(bject, netngCunter, netedReult);
      } ele f (Ref(raw)) {
        
        currentReult.puh(raw.tStrng());
      }
    }
  }
  aync pareMarkedCntentPrp(cntentPrperte, reurce) {
    let ptnalCntent;
    f (Name(cntentPrperte)) {
      cnt prperte = reurce.get("Prperte");
      ptnalCntent = prperte.get(cntentPrperte.name);
    } ele f (Dct(cntentPrperte)) {