Change filename to channelz
diff --git a/grpc.gyp b/grpc.gyp
index 0d03a66..3edfe55 100644
--- a/grpc.gyp
+++ b/grpc.gyp
@@ -249,7 +249,7 @@
         'src/core/lib/channel/channel_stack.cc',
         'src/core/lib/channel/channel_stack_builder.cc',
         'src/core/lib/channel/channel_trace.cc',
-        'src/core/lib/channel/channel_trace_registry.cc',
+        'src/core/lib/channel/channelz_registry.cc',
         'src/core/lib/channel/connected_channel.cc',
         'src/core/lib/channel/handshaker.cc',
         'src/core/lib/channel/handshaker_factory.cc',
@@ -598,7 +598,7 @@
         'src/core/lib/channel/channel_stack.cc',
         'src/core/lib/channel/channel_stack_builder.cc',
         'src/core/lib/channel/channel_trace.cc',
-        'src/core/lib/channel/channel_trace_registry.cc',
+        'src/core/lib/channel/channelz_registry.cc',
         'src/core/lib/channel/connected_channel.cc',
         'src/core/lib/channel/handshaker.cc',
         'src/core/lib/channel/handshaker_factory.cc',
@@ -829,7 +829,7 @@
         'src/core/lib/channel/channel_stack.cc',
         'src/core/lib/channel/channel_stack_builder.cc',
         'src/core/lib/channel/channel_trace.cc',
-        'src/core/lib/channel/channel_trace_registry.cc',
+        'src/core/lib/channel/channelz_registry.cc',
         'src/core/lib/channel/connected_channel.cc',
         'src/core/lib/channel/handshaker.cc',
         'src/core/lib/channel/handshaker_factory.cc',
@@ -1038,7 +1038,7 @@
         'src/core/lib/channel/channel_stack.cc',
         'src/core/lib/channel/channel_stack_builder.cc',
         'src/core/lib/channel/channel_trace.cc',
-        'src/core/lib/channel/channel_trace_registry.cc',
+        'src/core/lib/channel/channelz_registry.cc',
         'src/core/lib/channel/connected_channel.cc',
         'src/core/lib/channel/handshaker.cc',
         'src/core/lib/channel/handshaker_factory.cc',