Remove libchrome dependency from operations_generator.h am: e70b6b437c am: 27189055b0

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

Change-Id: I356116d99e265bc298e6a3345316ba634b77a460
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>