Revert "Change version checks to use SdkLevel.isAtLeast*"

Revert "fix broken build on erorrprone"

Revert submission 17730702-fixErrorProneBuild

Reason for revert: Breaks Launcher3 unbundled build by using hidden library in main Launcher code
Reverted Changes:
Id0ce4d308:Change version checks to use SdkLevel.isAtLeast*
I8fc801b00:fix broken build on erorrprone

Change-Id: I8e9a80dd9e9f79c30635cc6be8e3efb2ebbf42af
6 files changed