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Change waitForWindow() test helper to support regex as `windowId`
prefix. This is a preparation to allow apps to run with slightly
different name in the HTML file to allow switching the HTML file to use
JS module.

Change the tests `OpenAudioFiles/FilesAppBrowserTest*` to use regex so
it can run with `audio_player.html` and `audi_player_modules.html`.
Preparing to convert Audio Player foreground page to run with JS
modules.

Bug: 1133186
Change-Id: I8f93000408f824c119e151e67c562fb4c9a25652
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2546303
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Auto-Submit: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Jeremie Boulic <jboulic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828614}