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Gaia id should never be an email address, and there is a dcheck to guard
against this:
https://source.chromium.org/chromium/chromium/src/+/master:google_apis/gaia/core_account_id.cc;l=34

I have no idea why this was not triggering previously.

Bug: None
Test: browser_tests --gtest_filter="Assistant*"
Change-Id: I47775ec00afd67ea31d92ea09bdf02267ba06672
Cq-Include-Trybots: luci.chrome.try:linux-chromeos-chrome
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2548294
Commit-Queue: Jeroen Dhollander <jeroendh@chromium.org>
Commit-Queue: Xiaohui Chen <xiaohuic@chromium.org>
Auto-Submit: Jeroen Dhollander <jeroendh@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829061}