Revert "support scroll backward to minus one screen via voice/switch access"

This reverts commit d5af944f414588b4f964d176ebc9193f082daf7c.

Reason for revert: Test failure on master that might be related to this code change.

Change-Id: I269bf5b0a6505da291e1ff4ed181a851268d6ed8
2 files changed