Revert "Add Boca API key."

This reverts commit 43bf3dc6dbb6d8ca8513689f94b662b28e0fee97.

Reason for revert: Causes massive breakage in ChromeOS tests all over the tree. Bisected as culprit.

Original change's description:
> Add Boca API key.
>
> The Boca API key will be used for Live Translate on ChromeOS.
>
> Bug: b/359931233
> Change-Id: Ie9b18ec6d0eb781c245301125b177ed4161386c4
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5908987
> Reviewed-by: Avynn Donaghe <avynn@google.com>
> Commit-Queue: Dorian Brandon <dorianbrandon@google.com>
> Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1364855}

Bug: b/359931233
Change-Id: Ifc49a7176f484f511edf11601b9afedca2f34e23
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5912855
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Steinar H Gunderson <sesse@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Owners-Override: Steinar H Gunderson <sesse@chromium.org>
Commit-Queue: Steinar H Gunderson <sesse@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1364904}