Prevent dream service finishSelf before it was attached

Bring back stopSelf logic to prevent dream service finishSelf before any
token attached.

Fix: 150818348
Test: manual test, won't throw exp while leaving dream service.
Merged-In: I31bb4f32013b9fa0aa2263b94117060e4d3a7341
Change-Id: I31bb4f32013b9fa0aa2263b94117060e4d3a7341
1 file changed