Revert "Convert DCHECKs to CHECKs for SlideBlackPage"

This reverts commit a1daac358c42c50c68558116fffbcf6f598622d8.

Reason for revert: b/294500404 is fixed and hence the extra logging isn't required.

Change-Id: I39404bafc6e6a3c183d5a4b93f1a448453155868
1 file changed