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This change updates CloudPrintProxyService methods to take base::Value
instead of base::DictionaryValue pointers/references and call base::BindOnce()
instead of base::Bind(). ServiceProcessControl implementation was updated to
use base::OnceClosure accordingly.

Bug: 646113
Change-Id: Id4ff1b0ffd96ec27969bd489ab64503d85c7d6c6
Reviewed-on: https://chromium-review.googlesource.com/998522Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Oksana Zhuravlova <oksamyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548643}