Revert "Have createRootTask return TaskAppearInfo"

Revert "ARC++ changes to mirror changes to createRootTask"

Revert submission 12855635-create-root-task

Reason for revert: b/171369770
Reverted Changes:
Iabf090caa:ARC++ changes to mirror changes to createRootTask
I5948e6234:Have createRootTask return TaskAppearInfo
Fixes: 171369770
Bug: 169266958

Change-Id: Iee1cf0b30e368987931f928de8c691640e18286a
10 files changed