Custom fields do not get deleted in remote live after publish

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.1.10 DXP FP1, 7.1.1 CE GA2, 7.1.10.1 SP1, 7.1.X, Master
• Component/s: Content Publishing > Staging, Portal Configuration, Portal Configuration > Custom Fields
• Labels:
  • 7.1-could
  • INACTIVE
  • QA-AUTOMATION
  • backend_test
  • ee-ts
  • liferay-dxp-71-sp1
  • liferay-fixpack-dxp-1-7110
  • qa_test_mapped
  • staging_testing
• Branch Version/s:
  7.1.x
• Backported to Branch:
  Committed
• Fix Priority: 4
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/61872

Steps to reproduce:

1. Enable Remote Staging (Not reproducible in Local Staging)
2. Navigate to Control Panel > Configuration > Custom Fields > Document
3. Add new custom field for Document
4. Add new file entry and fill the custom field for that file entry
5. Export Custom Fields portlet on staging server, then import it to the remote live (this is a new step after the fix)
6. Publish to Remote Live
7. Assert document in live contains the custom field value
8. Go back to staged site
9. Delete the custom field you created in step 3
10. Assert document does not have the custom field value
11. Export Custom Fields portlet on staging server with deletions included, then import it to the remote live with the deletions included (this is a new step after the fix)
12. Publish to Remote Live
13. Navigate to document

Expected result: File entry does not have the custom field and value.
Actual result: File entry still displays the custom field and value.

Reproduced on:
Tomcat 8.0.32 + MySQL 5.6
Portal master GIT ID: c24a713afaa76290b098c57d0761cbb3479ea375