Use the new fingerprint during unpacking, not the old.

components/update_client/action_update.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/update_client/action_update.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 121 matching lines @@
       FROM_HERE,
       base::Bind(&ActionUpdate::DoInstallOnBlockingTaskRunner,
                  base::Unretained(this), update_context_, item, crx_path));
 }
 
 void ActionUpdate::DoInstallOnBlockingTaskRunner(
     UpdateContext* update_context,
     CrxUpdateItem* item,
     const base::FilePath& crx_path) {
   unpacker_ = new ComponentUnpacker(
-      item->component.pk_hash, crx_path, item->component.fingerprint,
+      item->component.pk_hash, crx_path, item->next_fp,
       item->component.installer,
       update_context->config->CreateOutOfProcessPatcher(),
       update_context->blocking_task_runner);
   unpacker_->Unpack(base::Bind(&ActionUpdate::EndUnpackingOnBlockingTaskRunner,
                                base::Unretained(this), update_context, item,
                                crx_path));
 }
 
 void ActionUpdate::EndUnpackingOnBlockingTaskRunner(
     UpdateContext* update_context,
@@ skipping 211 matching lines @@
 
   item->error_category = static_cast<int>(UnpackerErrorToErrorCategory(error));
   item->error_code = error;
   item->extra_code1 = extended_error;
   ChangeItemState(item, CrxUpdateItem::State::kNoUpdate);
 
   UpdateCrxComplete(item);
 }
 
 }  // namespace update_client