Make implicit intent immutable. (cherry picked from commit e42611f83cc72d22ed99fe3a8b79386d76ae5fa6) Test: make Fix: 154627439 Change-Id: Ifee830595bb145aede4dad1d9e42a20e54b6be66 Merged-In: Ifee830595bb145aede4dad1d9e42a20e54b6be66 (cherry picked from commit 7aae8cce330cb9b8ebca7b68da3abcd8e2d5a272)