Revert "Handle resume of VABC updates by emitting labels"

This reverts commit 24599af599acf74b71a555a8eeb827bedcd672b5.

Reason for revert: b/173009837

Test: 1. update_device.py ota.zip
--extra-headers="SWITCH_SLOT_ON_REBOOT=0"
      2. update_device.py ota.zip
      3. Verity that 2 did not re-start the entire update, only fs
                  verification and postinstall may re-run.

Bug: 173009837

Change-Id: Ia31025ebc68a5e6a72d7a0919994d614213270d1
diff --git a/payload_consumer/partition_writer.cc b/payload_consumer/partition_writer.cc
index 12b206e..ec36d06 100644
--- a/payload_consumer/partition_writer.cc
+++ b/payload_consumer/partition_writer.cc
@@ -242,14 +242,12 @@
     const InstallPlan::Partition& install_part,
     DynamicPartitionControlInterface* dynamic_control,
     size_t block_size,
-    PrefsInterface* prefs,
     bool is_interactive)
     : partition_update_(partition_update),
       install_part_(install_part),
       dynamic_control_(dynamic_control),
       interactive_(is_interactive),
-      block_size_(block_size),
-      prefs_(prefs) {}
+      block_size_(block_size) {}
 
 PartitionWriter::~PartitionWriter() {
   Close();