Replace WIDEVINE_CDM_AVAILABLE with a gyp define 'enable_widevine_cdm'.

chromecast/renderer/key_systems_cast.cc

 // Copyright 2014 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.
 
 #include "chromecast/renderer/key_systems_cast.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "chromecast/media/base/key_systems_common.h"
 #include "components/cdm/renderer/widevine_key_systems.h"
 #include "media/base/eme_constants.h"
 
 #include "widevine_cdm_version.h" // In SHARED_INTERMEDIATE_DIR.
 
 namespace chromecast {
 namespace shell {
 
 void AddKeySystemWithCodecs(
     const std::string& key_system_name,
     std::vector< ::media::KeySystemInfo>* concrete_key_systems) {
   ::media::KeySystemInfo info(key_system_name);
   info.supported_codecs = ::media::EME_CODEC_MP4_ALL;
   concrete_key_systems->push_back(info);
 }
 
 void AddChromecastKeySystems(
     std::vector< ::media::KeySystemInfo>* key_systems_info) {
-#if defined(WIDEVINE_CDM_AVAILABLE)
+#if defined(ENABLE_WIDEVINE_CDM)
   AddWidevineWithCodecs(cdm::WIDEVINE,
                         ::media::EME_CODEC_MP4_ALL,
                         key_systems_info);
 #endif
 
 #if defined(PLAYREADY_CDM_AVAILABLE)
   AddKeySystemWithCodecs(media::kChromecastPlayreadyKeySystem,
                          key_systems_info);
 #endif
 }
 
 }  // namespace shell
 }  // namespace chromecast