The user preferred languages should be sent to the GPUProcess by the UIProcess, not the untrusted WebProcesses.
<rdar://107917551>
Pull request: https://github.com/WebKit/WebKit/pull/13213
Committed 263465@main (cfd1105a3437): <https://commits.webkit.org/263465@main> Reviewed commits have been landed. Closing PR #13213 and removing active labels.