Move method_config module from ext/client_channel to lib/transport.
diff --git a/binding.gyp b/binding.gyp
index 390cc52..a752d4c 100644
--- a/binding.gyp
+++ b/binding.gyp
@@ -669,6 +669,7 @@
         'src/core/lib/transport/mdstr_hash_table.c',
         'src/core/lib/transport/metadata.c',
         'src/core/lib/transport/metadata_batch.c',
+        'src/core/lib/transport/method_config.c',
         'src/core/lib/transport/static_metadata.c',
         'src/core/lib/transport/timeout_encoding.c',
         'src/core/lib/transport/transport.c',
@@ -735,7 +736,6 @@
         'src/core/ext/client_channel/lb_policy.c',
         'src/core/ext/client_channel/lb_policy_factory.c',
         'src/core/ext/client_channel/lb_policy_registry.c',
-        'src/core/ext/client_channel/method_config.c',
         'src/core/ext/client_channel/parse_address.c',
         'src/core/ext/client_channel/resolver.c',
         'src/core/ext/client_channel/resolver_factory.c',