Bug 471020 - Update python script of wpt tests to perform binary read of image file. r=bz

testing/web-platform/tests/fetch/nosniff/resources/image.py

@@ -3,7 +3,7 @@ import os.path
 def main(request, response):
     type = request.GET.first("type", None)
 
-    body = open(os.path.join(os.path.dirname(__file__), "../../../images/blue96x96.png")).read()
+    body = open(os.path.join(os.path.dirname(__file__), "../../../images/blue96x96.png"), "rb").read()
 
     response.add_required_headers = False
     response.writer.write_status(200)