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We'll want to break up ppb_nacl_private_impl.cc instead of lumping things into
one large file. This change makes the method for getting CPU feature attributes
easier to reuse, and renames the sandbox_arch.{cc,h} files in the process.

This is split off from a larger change to remove FileDownloader in the trusted
plugin.

BUG=370556
R=bbudge@chromium.org

Review URL: https://codereview.chromium.org/399983002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@283861 0039d316-1c4b-4281-b951-d872f2087c98