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The app window can sometimes get un-maximized, e.g. by snapping it to
the side (crbug.com/966889).

These changes ensure that even when these bugs happen, the app will be
maximized again the next time it launches (ie, at next sign-in):

* Removing the window ID ensures bad bounds aren't cached in the user's
  profile.
* Calling window.maximize() in the window-created callback is usually a
  no-op, but guards against other bugs preventing the app window from
  opening maximized.

Bug: 930285
Change-Id: Icb1edacef86dd71cc69f8b9dde2b8139b0c270b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1638279
Auto-Submit: Michael Giuffrida <michaelpg@chromium.org>
Commit-Queue: Bruno Santos <brunoad@chromium.org>
Reviewed-by: Bruno Santos <brunoad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665994}