Move ENABLE_PEPPER_CDMS to a buildflag header.

third_party/widevine/cdm/widevine_cdm_common.h

Index: third_party/widevine/cdm/widevine_cdm_common.h
diff --git a/third_party/widevine/cdm/widevine_cdm_common.h b/third_party/widevine/cdm/widevine_cdm_common.h
index e0344947278d308ff7fcd29aa3420a3019e494e3..1a962a01160a4e69c6fce16113868cc54fda84e7 100644
--- a/third_party/widevine/cdm/widevine_cdm_common.h
+++ b/third_party/widevine/cdm/widevine_cdm_common.h
@@ -5,6 +5,8 @@
 #ifndef WIDEVINE_CDM_WIDEVINE_CDM_COMMON_H_
 #define WIDEVINE_CDM_WIDEVINE_CDM_COMMON_H_
 
+#include "ppapi/features/features.h"
+
 // This file defines constants common to all Widevine CDM versions.
 
 // Widevine CDM version contains 4 components, e.g. 1.4.0.195.
@@ -28,7 +30,7 @@ const char kWidevineCdmDisplayName[] = "Widevine Content Decryption Module";
 const char kWidevineCdmDescription[] =
     "Enables Widevine licenses for playback of HTML audio/video content.";
 
-#if defined(ENABLE_PEPPER_CDMS)
+#if BUILDFLAG(ENABLE_PEPPER_CDMS)
 const char kWidevineCdmPluginMimeType[] = "application/x-ppapi-widevine-cdm";
 const char kWidevineCdmPluginMimeTypeDescription[] =
     "Widevine Content Decryption Module";
@@ -60,6 +62,6 @@ const char kCdmSupportedCodecAvc1[] = "avc1";
 // CDM is installed by the component installer instead of the Chrome installer.
 #define WIDEVINE_CDM_IS_COMPONENT
 #endif  // defined(OS_MACOSX) || defined(OS_WIN)
-#endif  // defined(ENABLE_PEPPER_CDMS)
+#endif  // BUILDFLAG(ENABLE_PEPPER_CDMS)
 
 #endif  // WIDEVINE_CDM_WIDEVINE_CDM_COMMON_H_