Move string descriptor getters from UsbDeviceHandle to UsbDevice.

apps/saved_devices_service.cc

 // 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.
 
 #include "apps/saved_devices_service.h"
 
 #include <set>
 #include <vector>
 
 #include "apps/saved_devices_service_factory.h"
@@ skipping 140 matching lines @@
            persistent_devices_.begin();
        it != persistent_devices_.end();
        ++it) {
     if (it->vendor_id != device->vendor_id()) {
       continue;
     }
     if (it->product_id != device->product_id()) {
       continue;
     }
     if (!have_serial_number) {
-      scoped_refptr<UsbDeviceHandle> device_handle = device->Open();
-      if (!device_handle.get()) {
-        break;
-      }
-      if (!device_handle->GetSerial(&serial_number)) {
+      if (!device->GetSerialNumber(&serial_number)) {
         break;
       }
       have_serial_number = true;
     }
     if (it->serial_number != serial_number) {
       continue;
     }
     return true;
   }
   return false;
@@ skipping 135 matching lines @@
   std::map<std::string, SavedDevices*>::const_iterator it =
       extension_id_to_saved_devices_.find(extension_id);
   if (it != extension_id_to_saved_devices_.end()) {
     return it->second;
   }
 
   return NULL;
 }
 
 }  // namespace apps