Cast: Adding helper crypto classes

media/cast/cast_sender.gyp

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'includes': [
     'audio_sender/audio_sender.gypi',
     'congestion_control/congestion_control.gypi',
     'video_sender/video_sender.gypi',
   ],
   'targets': [
     {
       'target_name': 'cast_sender',
       'type': 'static_library',
       'include_dirs': [
         '<(DEPTH)/',
       ],
       'sources': [
         'cast_sender.h',
         'cast_sender_impl.cc',
         'cast_sender_impl.h',
       ], # source
       'dependencies': [
-        '<(DEPTH)/crypto/crypto.gyp:crypto',
         '<(DEPTH)/media/cast/transport/cast_transport.gyp:cast_transport',
         'audio_sender',
         'congestion_control',
         'rtcp/rtcp.gyp:cast_rtcp',
         'video_sender',
       ], # dependencies
     },
   ],
 }