Remove orphaned files.

webrtc/base/base.gyp

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 {
   'includes': [ '../build/common.gypi', ],
@@ skipping 345 matching lines @@
         'sslconfig.h',
         'sslfingerprint.cc',
         'sslfingerprint.h',
         'sslidentity.cc',
         'sslidentity.h',
         'sslroots.h',
         'sslsocketfactory.cc',
         'sslsocketfactory.h',
         'sslstreamadapter.cc',
         'sslstreamadapter.h',
-        'sslstreamadapterhelper.cc',
-        'sslstreamadapterhelper.h',
         'stream.cc',
         'stream.h',
         'task.cc',
         'task.h',
         'taskparent.cc',
         'taskparent.h',
         'taskrunner.cc',
         'taskrunner.h',
         'testclient.cc',
         'testclient.h',
@@ skipping 371 matching lines @@
     },
     {
      'target_name': 'gtest_prod',
       'type': 'static_library',
       'sources': [
         'gtest_prod_util.h',
       ],
     },
   ],
 }