"typedef Foo Bar" -> "using Bar = Foo" in //mojo/edk/....

mojo/edk/system/channel.h

Index: mojo/edk/system/channel.h
diff --git a/mojo/edk/system/channel.h b/mojo/edk/system/channel.h
index 93ba87ae95743ec56b7b4ec91a1a4c766a8f1c89..a22d506fc86cadc5b6f5443066a80dab67156820 100644
--- a/mojo/edk/system/channel.h
+++ b/mojo/edk/system/channel.h
@@ -235,16 +235,16 @@ class MOJO_SYSTEM_IMPL_EXPORT Channel
   // Has a reference to us.
   ChannelManager* channel_manager_;
 
-  typedef base::hash_map<ChannelEndpointId, scoped_refptr<ChannelEndpoint>>
-      IdToEndpointMap;
+  using IdToEndpointMap =
+      base::hash_map<ChannelEndpointId, scoped_refptr<ChannelEndpoint>>;
   // Map from local IDs to endpoints. If the endpoint is null, this means that
   // we're just waiting for the remove ack before removing the entry.
   IdToEndpointMap local_id_to_endpoint_map_;
   // Note: The IDs generated by this should be checked for existence before use.
   LocalChannelEndpointIdGenerator local_id_generator_;
 
-  typedef base::hash_map<ChannelEndpointId, scoped_refptr<IncomingEndpoint>>
-      IdToIncomingEndpointMap;
+  using IdToIncomingEndpointMap =
+      base::hash_map<ChannelEndpointId, scoped_refptr<IncomingEndpoint>>;
   // Map from local IDs to incoming endpoints (i.e., those received inside other
   // messages, but not yet claimed via |DeserializeEndpoint()|).
   IdToIncomingEndpointMap incoming_endpoints_;