Move ENABLE_PEPPER_CDMS to a buildflag header.

media/base/key_system_properties.cc

 // 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.
 
 #include "media/base/key_system_properties.h"
 
 #include "base/logging.h"
+#include "ppapi/features/features.h"
 
 namespace media {
 
 SupportedCodecs KeySystemProperties::GetSupportedSecureCodecs() const {
 #if !defined(OS_ANDROID)
   NOTREACHED();
 #endif
   return EME_CODEC_NONE;
 }
 
 bool KeySystemProperties::UseAesDecryptor() const {
   return false;
 }
 
 std::string KeySystemProperties::GetPepperType() const {
-#if !defined(ENABLE_PEPPER_CDMS)
+#if !BUILDFLAG(ENABLE_PEPPER_CDMS)
   NOTREACHED();
 #endif
   return "";
 }
 
 }  // namespace media