Remove libchrome dependency from operations_generator.h am: e70b6b437c

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/3303697

Change-Id: Iae54f5e66fc0aea811d3a19ae9bd6873a30f09ea
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>