Move BitrateAllocator from BitrateController logic to Call.

webrtc/call/webrtc_call.gypi

 # Copyright (c) 2013 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.
 {
   'variables': {
     'webrtc_call_dependencies': [
       '<(webrtc_root)/common.gyp:webrtc_common',
       '<(webrtc_root)/modules/modules.gyp:rtp_rtcp',
       '<(webrtc_root)/system_wrappers/system_wrappers.gyp:system_wrappers',
       '<(webrtc_root)/webrtc.gyp:rtc_event_log',
     ],
     'webrtc_call_sources': [
+      'call/bitrate_allocator.cc',
       'call/call.cc',
       'call/congestion_controller.cc',
       'call/transport_adapter.cc',
       'call/transport_adapter.h',
     ],
   },
 }