Replace WIDEVINE_CDM_AVAILABLE with a gyp define 'enable_widevine_cdm'.

third_party/widevine/cdm/widevine_cdm.gyp

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'widevine_cdm_version_h_file%': 'widevine_cdm_version.h',
     'widevine_cdm_binary_files%': [],
     'conditions': [
-      [ 'branding == "Chrome"', {
+      [ 'enable_widevine_cdm == 1', {
         'conditions': [
+          [ 'OS == "android"', {
+            'widevine_cdm_version_h_file%':
+                'android/widevine_cdm_version.h',
+          }],
           [ 'chromeos == 1', {
             'widevine_cdm_version_h_file%':
                 'chromeos/<(target_arch)/widevine_cdm_version.h',
             'widevine_cdm_binary_files%': [
               'chromeos/<(target_arch)/libwidevinecdm.so',
             ],
           }],
           [ 'OS == "linux" and chromeos == 0', {
             'widevine_cdm_version_h_file%':
                 'linux/<(target_arch)/widevine_cdm_version.h',
@@ skipping 11 matching lines @@
           [ 'OS == "win"', {
             'widevine_cdm_version_h_file%':
                 'win/<(target_arch)/widevine_cdm_version.h',
             'widevine_cdm_binary_files%': [
               'win/<(target_arch)/widevinecdm.dll',
               'win/<(target_arch)/widevinecdm.dll.lib',
             ],
           }],
         ],
       }],
-      [ 'OS == "android"', {
-        'widevine_cdm_version_h_file%':
-            'android/widevine_cdm_version.h',
-      }],
     ],
   },
   'includes': [
     '../../../build/util/version.gypi',
   ],
 
   # Always provide a target, so we can put the logic about whether there's
   # anything to be done in this file (instead of a higher-level .gyp file).
   'targets': [
     {
@@ skipping 95 matching lines @@
       'conditions': [
         [ 'branding == "Chrome" and OS == "linux"', {
           'dependencies': [
             '<(DEPTH)/third_party/widevine/test/license_server/license_server.gyp:test_license_server',
           ],
         }],
       ],
     },
   ],
 }