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Widget::InitParams setup is different in classic ash vs. mash.
Centralize the boilerplate code. This eliminates some ash/shell.h
includes, making it clearer that there's only one issue here.
It also reduces the chance of weird compiler errors if you
copy/paste the boilerplate but forget the type converters header.

Bug: 756057
Test: browser_tests
Change-Id: I3f1c76f2b174ef305697f8551a6923534a73dbaf
Reviewed-on: https://chromium-review.googlesource.com/999813
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548875}