nebraska: Move NebraskaHandler into NebraskaServer

This is a handle that is used only by the NebraskaServer, but it is
currently dangling in the module. Moved it there.

BUG=chromium:920404
TEST=unittest

Change-Id: I6d498b22d4b651713df62727214a9900b6450500
Reviewed-on: https://chromium-review.googlesource.com/1521151
Commit-Ready: Amin Hassani <ahassani@chromium.org>
Tested-by: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Xiaochu Liu <xiaochu@chromium.org>
2 files changed