Move ENABLE_PEPPER_CDMS to a buildflag header.

components/cdm/renderer/external_clear_key_key_system_properties.h

 // Copyright 2016 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 COMPONENTS_CDM_RENDERER_EXTERNAL_CLEAR_KEY_KEY_SYSTEM_PROPERTIES_H_
 #define COMPONENTS_CDM_RENDERER_EXTERNAL_CLEAR_KEY_KEY_SYSTEM_PROPERTIES_H_
 
 #include <string>
 
 #include "build/build_config.h"
 #include "media/base/key_system_properties.h"
+#include "ppapi/features/features.h"
 
 namespace cdm {
 
-#if defined(ENABLE_PEPPER_CDMS)
+#if BUILDFLAG(ENABLE_PEPPER_CDMS)
 extern const char kExternalClearKeyPepperType[];
 #endif
 
 // KeySystemProperties implementation for external Clear Key key systems.
 class ExternalClearKeyProperties : public media::KeySystemProperties {
  public:
   explicit ExternalClearKeyProperties(const std::string& key_system_name);
   ~ExternalClearKeyProperties() override;
 
   std::string GetKeySystemName() const override;
   bool IsSupportedInitDataType(
       media::EmeInitDataType init_data_type) const override;
   media::SupportedCodecs GetSupportedCodecs() const override;
   media::EmeConfigRule GetRobustnessConfigRule(
       media::EmeMediaType media_type,
       const std::string& requested_robustness) const override;
   media::EmeSessionTypeSupport GetPersistentLicenseSessionSupport()
       const override;
   media::EmeSessionTypeSupport GetPersistentReleaseMessageSessionSupport()
       const override;
   media::EmeFeatureSupport GetPersistentStateSupport() const override;
   media::EmeFeatureSupport GetDistinctiveIdentifierSupport() const override;
-#if defined(ENABLE_PEPPER_CDMS)
+#if BUILDFLAG(ENABLE_PEPPER_CDMS)
   std::string GetPepperType() const override;
 #endif
 
  private:
   const std::string key_system_name_;
 };
 
 }  // namespace cdm
 
 #endif  // COMPONENTS_CDM_RENDERER_EXTERNAL_CLEAR_KEY_KEY_SYSTEM_PROPERTIES_H_