Cherry pick [Android] When toggling AX script inject, also set native AX state.

Cherry pick of https://codereview.chromium.org/24559002/

Bug: 10911684

Original description:

[Android] When toggling AX script inject, also set native AX state.

When we enable/disable script injection, also update the flag that
says whether we should use native accessibility.

Change-Id: I7ab45f11ae44dd32f937e8828840a53180d4241c
2 files changed