Move ENABLE_PEPPER_CDMS to a buildflag header.

content/renderer/media/cdm/pepper_cdm_wrapper_impl.h

 // 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.
 
 #ifndef CONTENT_RENDERER_MEDIA_CDM_PEPPER_CDM_WRAPPER_IMPL_H_
 #define CONTENT_RENDERER_MEDIA_CDM_PEPPER_CDM_WRAPPER_IMPL_H_
 
-#if !defined(ENABLE_PEPPER_CDMS)
+#include "ppapi/features/features.h"
+
+#if !BUILDFLAG(ENABLE_PEPPER_CDMS)
 #error This file should only be included when ENABLE_PEPPER_CDMS is defined
 #endif
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "content/renderer/media/cdm/pepper_cdm_wrapper.h"
 
@@ skipping 43 matching lines @@
 
   ScopedHelperPlugin helper_plugin_;
   scoped_refptr<PepperPluginInstanceImpl> plugin_instance_;
 
   DISALLOW_COPY_AND_ASSIGN(PepperCdmWrapperImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_CDM_PEPPER_CDM_WRAPPER_IMPL_H_