**Link to PDF file (or attach file here):**
[tocheckFile.pdf](https://github.com/mozilla/pdf.js/files/240714/tocheckFile.pdf)

**Configuration:**
- Web browser and its version: FF45.0.2, Chrome Version 50.0.2661.86 (64-bit) 
- Operating system and its version: Mac OSX El Capitan

**\- PDF.js version:**
PDFJS.version = '1.1.215';
PDFJS.build = 'c9a7498';

**Steps to reproduce the problem:**
1. Use the lib to generate a PDF preview.

**What is the expected behavior? (add screenshot)**
PDF preview should have rendered completely. (frog head should be complete)

**What went wrong? (add screenshot)**
<img width="952" alt="imagesnotrenderinginpreview" src="https://cloud.githubusercontent.com/assets/10231850/14889265/cecb2d64-0d66-11e6-98e1-da2d39728552.png">

See attached screenshot in regards to the pdf file

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):

if (URL.createObjectURL && typeof Blob !== "undefined" && !forceDataSchema) {
    return URL.createObjectURL(new Blob([data], { type: contentType }));
  }
  
  const digits =
    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
  let buffer = `data:${contentType};base64,`;
  for (let i = 0, ii = data.length; i < ii; i += 3) {
    const b1 = data[i] & 0xff;
    const b2 = data[i + 1] & 0xff;
    const b3 = data[i + 2] & 0xff;
    const d1 = b1 >> 2,
      d2 = ((b1 & 3) << 4) | (b2 >> 4);
    const d3 = i + 1 < ii ? ((b2 & 0xf) << 2) | (b3 >> 6) : 64;
    const d4 = i + 2 < ii ? b3 & 0x3f : 64;
    buffer += digits[d1] + digits[d2] + digits[d3] + digits[d4];
  }
  return buffer;
}
export {
  AbortException,
  AnnotationActionEventType,
  AnnotationBorderStyleType,
  AnnotationFieldFlag,
  AnnotationFlag,
  AnnotationMarkedState,
  AnnotationMode,
  AnnotationReplyType,
  AnnotationReviewState,