De-flake HistoricalTabSaverImplTest#testCreateHistoricalTab_InvalidUrls

The test timeouts on some bots while trying to load the chrome://flags
page due to a recent change https://crrev.com/c/4903283.

Work around this problem by changing the URL to chrome://version which
should be faster to load. The only thing that matters here is the
chrome:// URL scheme.

Bug: 1487496
Change-Id: Ieb224a3a1c67d6c7f1235fe86ec3e26a74a52850
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4919472
Reviewed-by: Calder Kitagawa <ckitagawa@chromium.org>
Auto-Submit: Alex Ilin <alexilin@chromium.org>
Commit-Queue: Alex Ilin <alexilin@chromium.org>
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1206441}