Change TypeConverter<X,Y>::ConvertFrom and ConvertTo into a single symmetric

extensions/browser/api/serial/serial_connection.h

Index: extensions/browser/api/serial/serial_connection.h
diff --git a/extensions/browser/api/serial/serial_connection.h b/extensions/browser/api/serial/serial_connection.h
index 638b89859cd5814155ba4f11201de6d85048b9c1..8af1bf52f7c21266c5b4713864ef5852a7f5ac7f 100644
--- a/extensions/browser/api/serial/serial_connection.h
+++ b/extensions/browser/api/serial/serial_connection.h
@@ -196,18 +196,16 @@ class SerialConnection : public ApiResource,
 namespace mojo {
 
 template <>
-class TypeConverter<device::serial::HostControlSignalsPtr,
-                    extensions::core_api::serial::HostControlSignals> {
- public:
-  static device::serial::HostControlSignalsPtr ConvertFrom(
+struct TypeConverter<device::serial::HostControlSignalsPtr,
+                     extensions::core_api::serial::HostControlSignals> {
+  static device::serial::HostControlSignalsPtr Convert(
       const extensions::core_api::serial::HostControlSignals& input);
 };
 
 template <>
-class TypeConverter<device::serial::ConnectionOptionsPtr,
-                    extensions::core_api::serial::ConnectionOptions> {
- public:
-  static device::serial::ConnectionOptionsPtr ConvertFrom(
+struct TypeConverter<device::serial::ConnectionOptionsPtr,
+                     extensions::core_api::serial::ConnectionOptions> {
+  static device::serial::ConnectionOptionsPtr Convert(
       const extensions::core_api::serial::ConnectionOptions& input);
 };