Remove accidentally readded webrtc/base/sslstreamadapterhelper.cc
Remove accidentally readded webrtc/base/sslstreamadapterhelper.cc

This was readded by mistake in https://codereview.webrtc.org/1820023004/
(originally removed in  https://codereview.webrtc.org/1827853003)

TBR=torbjorng@webrtc.org

Review URL: https://codereview.webrtc.org/1842773002 .

Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#12142}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 4079cc301b97bfff805658c9ac15c4f116866338

Alkalyne/webrtctrunk,jchavanton/webrtc,jchavanton/webrtc,jchavanton/webrtc,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,jchavanton/webrtc,jchavanton/webrtc,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,jchavanton/webrtc,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,jchavanton/webrtc