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This eliminates some dependencies from NetworkingPrivateServiceClient
that will allow it to be moved to src/extensions.

It also changes NetworkingPrivatCrypto from a class to a namespace since that is how we use it.

BUG=363776

Review URL: https://codereview.chromium.org/442073003

Cr-Commit-Position: refs/heads/master@{#288396}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288396 0039d316-1c4b-4281-b951-d872f2087c98