User Agent: Restore back-compat

[kraftbj]

Jetpack 8.7 moved UA detection to a new package. There are some themes that, improperly, accessed the legacy methods statically.

In 8.7, the refactor would result in fatals for sites doing this.

Changes proposed in this Pull Request:

• Restore backcompat for themes calling methods statically. (Pre-existing notices would still fire.)

Jetpack product discussion

No.

Does this pull request change what data or activity we track or use?

No.

Testing instructions:

• Install pub/p2-breathe theme.

Proposed changelog entry for your changes:

• Backwards Compatibility: Prevent fatals on themes calling a method statically.

[jetpackbot]

Thank you for the great PR description!

When this PR is ready for review, please apply the [Status] Needs Review label. If you are an a11n, please have someone from your team review the code if possible. The Jetpack team will also review this PR and merge it to be included in the next Jetpack release.

E2E results is available here (for debugging purposes): https://jetpack-e2e-dashboard.herokuapp.com/pr-16430

Scheduled Jetpack release: August 4, 2020.
Scheduled code freeze: July 28, 2020

Generated by 🚫 dangerJS against 3bd5505

[matticbot]

Caution: This PR has changes that must be merged to WordPress.com
Hello kraftbj! These changes need to be synced to WordPress.com - If you 're an a11n, please commandeer, review, and approve D46076-code before merging this PR. Thank you!
This revision will be updated with each commit to this PR

[dereksmart]

thanks!

[kraftbj]

Cherry-picked to branch-8.7 via ac064db