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Revert of Remote assistance on Chrome OS Part V - It2MeHost Continue Window (patchset #5 id:120001 of https://codereview.chromium.org/690183002/)

Reason for revert:
Build failure on
http://build.chromium.org/p/chromium.chromiumos/buildstatus?builder=Linux%20ChromiumOS%20Builder%20%28dbg%29&number=54095

Original issue's description:
> Remote assistance on Chrome OS Part V - It2MeHost Continue Window
>
> This CL implements the ContinueWindow on ChromeOS, which will
> be shown to the user for confirmation after 10 minutes into a Remote
> Assistance session.
>
> To implement the ContinueWindow, this CL introduces a new class
> MessageBox, which is a re-usable component built on top of the
> widget framework.
>
> BUG=424908
>
> Committed: https://crrev.com/6410d7ad4937a4a86e9ad28b9ecf99f961305b2d
> Cr-Commit-Position: refs/heads/master@{#302657}

TBR=wez@chromium.org,dcaiafa@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=424908

Review URL: https://codereview.chromium.org/689093004

Cr-Commit-Position: refs/heads/master@{#302660}