Disable SpdyCredentialBuilderTest.* on Android bots.

Failing since they were introduced.
BUG=140991

Review URL: https://chromiumcodereview.appspot.com/10824193

git-svn-id: http://src.chromium.org/svn/trunk/src/build@150188 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

android/gtest_filter/net_unittests_disabled

@@ -124,3 +124,6 @@ VerifyMixed/CertVerifyProcWeakDigestTest.*
 # These are death tests and thus also disabled.
 PrioritizedDispatcherTest.CancelNull
 PrioritizedDispatcherTest.CancelMissing
+
+# crbug.com/140991
+SpdyCredentialBuilderTest.*