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Previously JingleThreadWrapper was initialized in the remoting PNaCl
plugin such that JingleThreadWrapper::current() was always returning
NULL. JingleThreadWrapper::current() is used only to implement
rtc::Thread::Send() and until recently Send() wasn't used in the parts
of webrtc used in remoting. Now rtc::StunRequest uses Send(), which
crashes the plugin.

Added JingleThreadWrapper::WrapTaskRunner() that properly initializes
current() and is used in the remoting plugin now.

Also JingleThreadWrapper is no longer passes SocketServer to the
parent as it is no longer necessary.

BUG=451643

Review URL: https://codereview.chromium.org/876433003

Cr-Commit-Position: refs/heads/master@{#313213}