Description of Change

In https://crrev.com/c/6274964 the implementation for querying the physical memory on macOS was changed to use a sysctl call. In that same change the sysctl call was added to the sanbox allowlist.

This causes a problematic behavior: if an app that's running the old implementation (no sandbox exclusion for that sysctl call) gets swapped with the new implementation (uses new sysctl call) while it's running, then new child processes will trigger a sandbox permission error when calling the new method.

While this "hot-swapping" behavior isn't supported, many enterprise update scripts may do this anyways, triggering an unfortunate user experience where child processes can never spawn but the browser process continues to live and terminate them (until the app is restarted).

This PR adds a patch to incorporate the old implementation as a fallback, giving apps a reasonable grace period as they update Electron versions.

Checklist

• PR description included and stakeholders cc'd
• npm test passes
• tests are changed or added
• relevant API documentation, tutorials, and examples are updated and follow the documentation style guide
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

Notes: Fixed a child process crash on macOS when the running application is replaced with one that has a newer implementation triggering the sandbox