build(aio): upgrade `zone.js` to 0.8.16

```
$ ls -l dist/*.js

 14942            dist/0.b19e913fbdd6507d346b.chunk.js
  1535            dist/inline.a1b446562b36eebb766d.bundle.js
523703            dist/main.19fec4390ff7837ee6ef.bundle.js
 37402  (+ 3088)  dist/polyfills.9f7e0e53bce2a6c8326e.bundle.js
 54001            dist/worker-basic.min.js

631583  (+ 3088)  total
```

aio/package.json

@@ -69,7 +69,7 @@
     "rxjs": "^5.2.0",
     "tslib": "^1.7.1",
     "web-animations-js": "^2.2.5",
-    "zone.js": "^0.8.12"
+    "zone.js": "^0.8.16"
   },
   "devDependencies": {
     "@angular/cli": "^1.3.0",

aio/scripts/_payload-limits.sh

@@ -3,7 +3,7 @@
 set -u -e -o pipefail
 
 declare -A limitUncompressed
-limitUncompressed=(["inline"]=1600 ["main"]=525000 ["polyfills"]=35000)
+limitUncompressed=(["inline"]=1600 ["main"]=525000 ["polyfills"]=38000)
 declare -A limitGzip7
 limitGzip7=(["inline"]=1000 ["main"]=127000 ["polyfills"]=12500)
 declare -A limitGzip9

aio/yarn.lock

@@ -8520,10 +8520,6 @@ zip-stream@~0.6.0:
     lodash "~3.10.1"
     readable-stream "~1.0.26"
 
-zone.js@^0.8.12:
-  version "0.8.12"
-  resolved "https://registry.yarnpkg.com/zone.js/-/zone.js-0.8.12.tgz#86ff5053c98aec291a0bf4bbac501d694a05cfbb"
-
-zone.js@^0.8.14:
+zone.js@^0.8.14, zone.js@^0.8.16:
   version "0.8.16"
   resolved "https://registry.yarnpkg.com/zone.js/-/zone.js-0.8.16.tgz#ac31b6c418f88c0f918ad6acd8a402aca9313abb"