Remove LegacyPromise in src/shared/annotation.js
Remove LegacyPromise in src/core/pdf_manager.js
Remove LegacyPromise in src/core/core.js
Merge pull request #4725 from Snuffleupagus/remove-LegacyPromise-pdf_manager.js

Remove LegacyPromise in src/core/pdf_manager.js
Merge pull request #4727 from Snuffleupagus/remove-LegacyPromise-annotation.js

Remove LegacyPromise in src/shared/annotation.js
Merge pull request #4726 from Snuffleupagus/remove-LegacyPromise-core.js

Remove LegacyPromise in src/core/core.js