Use the new gsid interface

This CL supports gsid refactoring aosp/1148898.

Test: adb shell am start-activity \
                -n com.android.dynsystem/com.android.dynsystem.VerificationActivity \
                -a android.os.image.action.START_INSTALL \
                -d file:///storage/emulated/0/Download/system.raw.gz \
                --el KEY_SYSTEM_SIZE $(du -b system.raw|cut -f1) \
                --el KEY_USERDATA_SIZE 8589934592
Change-Id: I0209a1b0750e96623f90f134bb18d37254249fbd