Move ENABLE_PEPPER_CDMS to a buildflag header.

components/cdm/renderer/widevine_key_system_properties.cc

Index: components/cdm/renderer/widevine_key_system_properties.cc
diff --git a/components/cdm/renderer/widevine_key_system_properties.cc b/components/cdm/renderer/widevine_key_system_properties.cc
index bb08615597e825722826e39238776baddad3763d..47b7103b0443f54dc4e7793941775615461683ce 100644
--- a/components/cdm/renderer/widevine_key_system_properties.cc
+++ b/components/cdm/renderer/widevine_key_system_properties.cc
@@ -4,6 +4,7 @@
 
 #include "components/cdm/renderer/widevine_key_system_properties.h"
 
+#include "ppapi/features/features.h"
 #include "widevine_cdm_version.h"  // In SHARED_INTERMEDIATE_DIR.
 
 #if defined(WIDEVINE_CDM_AVAILABLE)
@@ -165,7 +166,7 @@ EmeFeatureSupport WidevineKeySystemProperties::GetDistinctiveIdentifierSupport()
   return distinctive_identifier_support_;
 }
 
-#if defined(ENABLE_PEPPER_CDMS)
+#if BUILDFLAG(ENABLE_PEPPER_CDMS)
 std::string WidevineKeySystemProperties::GetPepperType() const {
   return kWidevineCdmPluginMimeType;
 }