Disable datachannel_unittest.cc

the test fails to compile because it uses incorrect gmock path (as 
some other tests).

TBR=wu@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/3849004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5121 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/talk/libjingle_tests.gyp b/talk/libjingle_tests.gyp
index 80e1e96..44fa8f7 100755
--- a/talk/libjingle_tests.gyp
+++ b/talk/libjingle_tests.gyp
@@ -375,7 +375,7 @@
       ],
       # TODO(ronghuawu): Reenable below unit tests that require gmock.
       'sources': [
-        'app/webrtc/datachannel_unittest.cc',
+        # 'app/webrtc/datachannel_unittest.cc',
         'app/webrtc/dtmfsender_unittest.cc',
         'app/webrtc/jsepsessiondescription_unittest.cc',
         'app/webrtc/localaudiosource_unittest.cc',