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This CL changes SessionService to no longer restore DEVTOOLS on chromeos.
I suspect it was never intentional that DEVTOOLS was being included
to be restored.

Devtools restore is messy.  It doesn't connect to the previous
page, and will also create an extra tab in the NORMAL browser
with a devtools:// url which shows nothing.

See screenshots at crbug.com/990158#c6

Bug: 990158
Change-Id: I4861785da13ab9500418119f7fb76e40b9217312
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1753998Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688781}