Revert "Let activities can be recreated in ON_START state"

This reverts commit d3ed35f3.

Reason for revert: Droidcop: Potential culprit for Bug 166391370 - verifying through Forrest before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.

Change-Id: Ib6007f01fdaf0ef74e8b630e5e13862f30689ef0