Bug 872282 - Point B2G unittests at new emulator, r=jgriffin

b2g/test/emulator.manifest

@@ -1,6 +1,6 @@
 [{
-"size": 659020310,
-"digest": "8201020a5214337cf19d43bb3fde8c4624d7a7a71f04a4522a34783194694fe5e66f8087acf6fe7080d7bf787b8311dd9ed8facfbac39198d0121f817b8eef32",
+"size": 677339898,
+"digest": "af1d883664bf4f02637060855d76026cceffd28a796ab3d65e16f1b0b6d1a8d5bb634388152ba63ecbfa2fbb1bd59317c0cfd508e163eaf950923b6b999369bc",
 "algorithm": "sha512",
 "filename": "emulator.zip"
 }]