Replace WIDEVINE_CDM_AVAILABLE with a gyp define 'enable_widevine_cdm'.

content/renderer/media/render_media_client.cc

Index: content/renderer/media/render_media_client.cc
diff --git a/content/renderer/media/render_media_client.cc b/content/renderer/media/render_media_client.cc
index 1922f3fbf2fa229e049ef9bacb38af884ccd5b61..2f7051cf90c1a4e53cee59f6211d0cc33be60a54 100644
--- a/content/renderer/media/render_media_client.cc
+++ b/content/renderer/media/render_media_client.cc
@@ -32,10 +32,10 @@ RenderMediaClient::~RenderMediaClient() {
 void RenderMediaClient::AddKeySystemsInfoForUMA(
     std::vector<media::KeySystemInfoForUMA>* key_systems_info_for_uma) {
   DVLOG(2) << __FUNCTION__;
-#if defined(WIDEVINE_CDM_AVAILABLE)
+#if defined(ENABLE_WIDEVINE_CDM)
   key_systems_info_for_uma->push_back(media::KeySystemInfoForUMA(
       kWidevineKeySystem, kWidevineKeySystemNameForUMA, true));
-#endif  // WIDEVINE_CDM_AVAILABLE
+#endif  // ENABLE_WIDEVINE_CDM
 }
 
 bool RenderMediaClient::IsKeySystemsUpdateNeeded() {
@@ -76,7 +76,7 @@ void RenderMediaClient::AddSupportedKeySystems(
 
   // Check whether all potentially supported key systems are supported. If so,
   // no need to update again.
-#if defined(WIDEVINE_CDM_AVAILABLE) && defined(WIDEVINE_CDM_IS_COMPONENT)
+#if defined(ENABLE_WIDEVINE_CDM) && defined(WIDEVINE_CDM_IS_COMPONENT)
   for (const media::KeySystemInfo& key_system_info : *key_systems_info) {
     if (key_system_info.key_system == kWidevineKeySystem)
       is_update_needed_ = false;