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Currently, NaClListener has supports two modes, SFI and non-SFI.
As a preparation of newlib switching of non-SFI mode, this CL splits into
each delegate class, so that, we can easily build non-SFI related code
only by PNaCl toolchain.

BUG=358465
TEST=Ran trybots.
CQ_EXTRA_TRYBOTS=tryserver.chromium.linux:linux_rel_precise32

Review URL: https://codereview.chromium.org/439713002

Cr-Commit-Position: refs/heads/master@{#288271}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288271 0039d316-1c4b-4281-b951-d872f2087c98