Sync with f8616d9
Sync with f8616d9

Synced with dart-lang/site-webdev 5-dev branch, commit f8616d9:
https://github.com/dart-lang/site-webdev/tree/f8616d946e9f43eaef871495c498c99063d42e61/examples/ng/doc/dependency-injection

googlearchive/dependency-injection,angular-examples/dependency-injection,googlearchive/dependency-injection,angular-examples/dependency-injection