Replace WIDEVINE_CDM_AVAILABLE with a gyp define 'enable_widevine_cdm'.

chrome/common/chrome_content_client.cc

Index: chrome/common/chrome_content_client.cc
diff --git a/chrome/common/chrome_content_client.cc b/chrome/common/chrome_content_client.cc
index 581229c5d529b15065672c3b81cb61eace9c1c7d..07ecd3d01d67b80bb9c1f84809aaf0a61c6fcfca 100644
--- a/chrome/common/chrome_content_client.cc
+++ b/chrome/common/chrome_content_client.cc
@@ -61,7 +61,7 @@
 #include "remoting/client/plugin/pepper_entrypoints.h"
 #endif
 
-#if defined(WIDEVINE_CDM_AVAILABLE) && defined(ENABLE_PEPPER_CDMS) && \
+#if defined(ENABLE_WIDEVINE_CDM) && defined(ENABLE_PEPPER_CDMS) && \
     !defined(WIDEVINE_CDM_IS_COMPONENT)
 #include "chrome/common/widevine_cdm_constants.h"
 #endif
@@ -252,7 +252,7 @@ void ComputeBuiltInPlugins(std::vector<content::PepperPluginInfo>* plugins) {
     }
   }
 
-#if defined(WIDEVINE_CDM_AVAILABLE) && defined(ENABLE_PEPPER_CDMS) && \
+#if defined(ENABLE_WIDEVINE_CDM) && defined(ENABLE_PEPPER_CDMS) && \
     !defined(WIDEVINE_CDM_IS_COMPONENT)
   static bool skip_widevine_cdm_file_check = false;
   if (PathService::Get(chrome::FILE_WIDEVINE_CDM_ADAPTER, &path)) {
@@ -293,7 +293,7 @@ void ComputeBuiltInPlugins(std::vector<content::PepperPluginInfo>* plugins) {
       skip_widevine_cdm_file_check = true;
     }
   }
-#endif  // defined(WIDEVINE_CDM_AVAILABLE) && defined(ENABLE_PEPPER_CDMS) &&
+#endif  // defined(ENABLE_WIDEVINE_CDM) && defined(ENABLE_PEPPER_CDMS) &&
         // !defined(WIDEVINE_CDM_IS_COMPONENT)
 
   // The Remoting Viewer plugin is built-in.