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This reverts commit fe5c2f3d.

Reason for revert: This appears to be causing flake in the WebUSB layout tests.

Original change's description:
> Dispatch interfacerequest event in a new microtask
> 
> This change modifies the MojoInterfaceInterceptor so that the
> 'interfacerequest' event, fired when a request for the intercepted
> interface is made, is dispatched in a new microtask instead of
> synchronously.
> 
> This has the benefit of not reentering JavaScript to execute event
> handlers synchronously which is both different from the usual case for
> binding interfaces that are provided by other processes and avoids the
> possibilty of attempting to dispatch this event to JavaScript from a
> scope where script is forbidden.
> 
> Change-Id: I08b8c25a04da047381a3786af08b62979ca7b837
> Reviewed-on: https://chromium-review.googlesource.com/594716
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Yuzhu Shen <yzshen@chromium.org>
> Commit-Queue: Reilly Grant <reillyg@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#491552}

TBR=dcheng@chromium.org,yzshen@chromium.org,reillyg@chromium.org

Change-Id: Ibc179e1313fceba9a6e8da37e5220ccb6aa7c204
Bug: 751955
Reviewed-on: https://chromium-review.googlesource.com/601007
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491864}