Contains code that uses dynamic as bottom

[srawlins]

(Basically a sister issue for dart-archive/discoveryapis_generator#181)

Once dart-archive/discoveryapis_generator#181 is fixed, googleapis need to be regenerated with code that does not use dynamic as bottom, before Dart 2.0 is released. dart-lang/sdk#29630

[jakobr-google]

There have been a number of Dart 2 fixes since, so this issue should be gone.