Rename WebAppsWebAppsChromeOsBrowserTest

The test class is now WebAppsChromeOsBrowserTest.

Fixes accidental rename.

Change-Id: I2e3dd15bea00bd0002b9a4da8c806b0cff4a14ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3139729


Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Auto-Submit: Eric Willigers <ericwilligers@chromium.org>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/main@{#918008}