Replace WIDEVINE_CDM_AVAILABLE with a gyp define 'enable_widevine_cdm'.

chrome/renderer/plugins/plugin_uma.cc

 // Copyright (c) 2011 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.
 
 #include "chrome/renderer/plugins/plugin_uma.h"
 
 #include <algorithm>
 #include <cstring>
 
 #include "base/metrics/histogram.h"
@@ skipping 160 matching lines @@
     return QUICKTIME;
 
   if (mime_type == content::kBrowserPluginMimeType)
     return BROWSER_PLUGIN;
 
   if (mime_type == content::kFlashPluginSwfMimeType ||
       mime_type == content::kFlashPluginSplMimeType) {
     return SHOCKWAVE_FLASH;
   }
 
-#if defined(ENABLE_PEPPER_CDMS)
+#if defined(ENABLE_PEPPER_CDMS) && defined(ENABLE_WIDEVINE_CDM)
   if (mime_type == kWidevineCdmPluginMimeType)
     return WIDEVINE_CDM;
 #endif
 
   return UNSUPPORTED_MIMETYPE;
 }