Update Token Binding code to the latest drafts

net/http/http_response_body_drainer_unittest.cc

Index: net/http/http_response_body_drainer_unittest.cc
diff --git a/net/http/http_response_body_drainer_unittest.cc b/net/http/http_response_body_drainer_unittest.cc
index abbb29c9cdf4c29e3a5d3dbb129f73733c9ee0b1..1788d0203dbeb1a8589f4706848b5ea37aa01bfd 100644
--- a/net/http/http_response_body_drainer_unittest.cc
+++ b/net/http/http_response_body_drainer_unittest.cc
@@ -111,8 +111,9 @@ class MockHttpStream : public HttpStream {
   void GetSSLInfo(SSLInfo* ssl_info) override {}
   void GetSSLCertRequestInfo(SSLCertRequestInfo* cert_request_info) override {}
   bool GetRemoteEndpoint(IPEndPoint* endpoint) override { return false; }
-  Error GetSignedEKMForTokenBinding(crypto::ECPrivateKey* key,
-                                    std::vector<uint8_t>* out) override {
+  Error GetTokenBindingSignature(crypto::ECPrivateKey* key,
+                                 TokenBindingType tb_type,
+                                 std::vector<uint8_t>* out) override {
     ADD_FAILURE();
     return ERR_NOT_IMPLEMENTED;
   }