Leave SSLParametersImpl.getDefaultX509TrustManager public.
Leave SSLParametersImpl.getDefaultX509TrustManager public.

I renamed this method from getDefaultTrustManager to
getDefaultX509TrustManager and erroneously made it private in
8d63ff1384e46407a7618df2b79b2b455795c396. I missed the fact that
it's being used from framework's
android.net.http.CertificateChainValidator.

This CL reverts this method to being public again.

Bug: 13563574
Change-Id: I601c651d631f5a2e4a04d21941186553988e5286

google/conscrypt,google/conscrypt,google/conscrypt,google/conscrypt,google/conscrypt,google/conscrypt