Fix CDM gyp to exclude x64 ChromeOS build from using a CDM.

BUG=none
TEST=Tested with x64 Linux build with chromeos=1.

Review URL: https://codereview.chromium.org/12217144

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@181981 0039d316-1c4b-4281-b951-d872f2087c98

third_party/widevine/cdm/widevine_cdm.gyp

@@ -72,7 +72,7 @@
                 '<(PRODUCT_DIR)/libwidevinecdm.so',
               ],
             }],
-            [ 'OS == "linux" and target_arch == "x64"', {
+            [ 'chromeos == 0 and OS == "linux" and target_arch == "x64"', {
               'libraries': [
                 # Copied by widevine_cdm_binaries.
                 '<(PRODUCT_DIR)/libwidevinecdm.so',