Remove __ANDROID_API__ #if checks.

__INTRODUCED_IN() does the right thing automatically now.

Bug: http://b/178449269
Test: treehugger
Change-Id: I9c0776bb4868f7f6a083dd52ca7ebedfffcc8f4c
Merged-In: I9c0776bb4868f7f6a083dd52ca7ebedfffcc8f4c
17 files changed