Remove SSLPrivateKey metadata hooks.

net/ssl/threaded_ssl_private_key.cc

Index: net/ssl/threaded_ssl_private_key.cc
diff --git a/net/ssl/threaded_ssl_private_key.cc b/net/ssl/threaded_ssl_private_key.cc
index 42f01f6c0ed315916e4ec09cab49fbcca3b896b9..53e8c34d40a0796846a8f42f0dea2d9874030ac6 100644
--- a/net/ssl/threaded_ssl_private_key.cc
+++ b/net/ssl/threaded_ssl_private_key.cc
@@ -55,18 +55,10 @@ ThreadedSSLPrivateKey::ThreadedSSLPrivateKey(
       task_runner_(std::move(task_runner)),
       weak_factory_(this) {}
 
-SSLPrivateKey::Type ThreadedSSLPrivateKey::GetType() {
-  return core_->delegate()->GetType();
-}
-
 std::vector<SSLPrivateKey::Hash> ThreadedSSLPrivateKey::GetDigestPreferences() {
   return core_->delegate()->GetDigestPreferences();
 }
 
-size_t ThreadedSSLPrivateKey::GetMaxSignatureLengthInBytes() {
-  return core_->delegate()->GetMaxSignatureLengthInBytes();
-}
-
 void ThreadedSSLPrivateKey::SignDigest(
     SSLPrivateKey::Hash hash,
     const base::StringPiece& input,