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

extensions/browser/api/serial/serial_api.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EXTENSIONS_BROWSER_API_SERIAL_SERIAL_API_H_
 #define EXTENSIONS_BROWSER_API_SERIAL_SERIAL_API_H_
 
 #include <string>
 
 #include "device/serial/serial.mojom.h"
@@ skipping 228 matching lines @@
   scoped_ptr<serial::SetControlSignals::Params> params_;
 };
 
 }  // namespace core_api
 
 }  // namespace extensions
 
 namespace mojo {
 
 template <>
-class TypeConverter<device::serial::DeviceInfoPtr,
-                    linked_ptr<extensions::core_api::serial::DeviceInfo> > {
- public:
-  static linked_ptr<extensions::core_api::serial::DeviceInfo> ConvertTo(
+struct TypeConverter<linked_ptr<extensions::core_api::serial::DeviceInfo>,
+                     device::serial::DeviceInfoPtr> {
+  static linked_ptr<extensions::core_api::serial::DeviceInfo> Convert(
       const device::serial::DeviceInfoPtr& input);
 };
 
 }  // namespace mojo
 
 #endif  // EXTENSIONS_BROWSER_API_SERIAL_SERIAL_API_H_