This reverts commit
8dccbc33df.
Find/replace didn't catch the use of `jvmTarget = "1.8"` in
`dev/integration_tests/android_engine_test/android/app/build.gradle` and
`android_engine_test` needed to have `"com.android.application"`
updated.
Should resolve issues related to the following messages being output on
stderr:
```
warning: [options] source value 8 is obsolete and will be removed in a future release"
warning: [options] target value 8 is obsolete and will be removed in a future release
warning: [options] To suppress warnings about obsolete options, use -Xlint:-options.
```
Fixes https://github.com/flutter/flutter/issues/165973
Towards https://github.com/flutter/flutter/issues/161261 (before I add
more tests).
This is a 1:1 move, with massaging of
`run_flutter_driver_android_tests.dart` to be more automated as tests
are added.
/cc @reidbaker
