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Revert of [Chromoting] Show any startup errors in the LoadingWindow. (patchset #5 id:80001 of https://codereview.chromium.org/1139543002/)

Reason for revert:
Syntax error in the JS, breaking the closure bot and almost surely doesn't work well/breaking something in remoting.
http://build.chromium.org/p/chromium.fyi/builders/Closure%20Compilation%20Linux/builds/22330/steps/compile/logs/stdio

Original issue's description:
> [Chromoting] Show any startup errors in the LoadingWindow.
>
> Show any connection errors during startup in the LoadingWindow rather
> than creating a new error window for the error.
>
> This cl also adds a new updateErrorMessage method to the MessageWindow
> to update the message and reset the message window as appropriate for
> an error message (disabling the spinner, updating the button label).
>
> BUG=
>
> Committed: https://crrev.com/d44e8a774ce99a89c350d10d5b3f9f644eb0c3d1
> Cr-Commit-Position: refs/heads/master@{#330022}

TBR=jamiewalch@chromium.org,garykac@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/1144593002

Cr-Commit-Position: refs/heads/master@{#330052}