Remove firebase_abstract_method_smoke_test (#159145)

Deleted Android embedding smoke test
`firebase_abstract_method_smoke_test`. It is part of v1 embedding
removal cleanup.

This test was marked bringup.

Fixes https://github.com/flutter/flutter/issues/158212

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TESTOWNERS

@@ -315,7 +315,6 @@
 /dev/integration_tests/deferred_components_test @gmackall @flutter/android
 
 ## Firebase tests
-/dev/integration_tests/abstract_method_smoke_test @reidbaker @flutter/android
 /dev/integration_tests/release_smoke_test @reidbaker @flutter/android
 
 ## Shards tests