Manage HidService lifetime in DeviceClient implementations.

device/hid/hid_service_mac.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 "device/hid/hid_service_mac.h"
 
 #include <CoreFoundation/CoreFoundation.h>
 #include <IOKit/hid/IOHIDDevice.h>
 
 #include <set>
@@ skipping 111 matching lines @@
                    << HexErrorCode(result);
     return;
   }
 
   // Drain devices_added_iterator_ to arm the notification.
   devices_removed_iterator_.reset(iterator);
   RemoveDevices();
   FirstEnumerationComplete();
 }
 
+HidServiceMac::~HidServiceMac() {}
+
 void HidServiceMac::Connect(const HidDeviceId& device_id,
                             const ConnectCallback& callback) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   const auto& map_entry = devices().find(device_id);
   if (map_entry == devices().end()) {
     task_runner_->PostTask(FROM_HERE, base::Bind(callback, nullptr));
     return;
   }
   scoped_refptr<HidDeviceInfo> device_info = map_entry->second;
@@ skipping 31 matching lines @@
     task_runner_->PostTask(FROM_HERE, base::Bind(callback, nullptr));
     return;
   }
 
   task_runner_->PostTask(
       FROM_HERE, base::Bind(callback, make_scoped_refptr(new HidConnectionMac(
                                           hid_device.release(), device_info,
                                           file_task_runner_))));
 }
 
-HidServiceMac::~HidServiceMac() {
-}
-
 // static
 void HidServiceMac::FirstMatchCallback(void* context, io_iterator_t iterator) {
   DCHECK_EQ(CFRunLoopGetMain(), CFRunLoopGetCurrent());
   HidServiceMac* service = static_cast<HidServiceMac*>(context);
   DCHECK_EQ(service->devices_added_iterator_, iterator);
   service->AddDevices();
 }
 
 // static
 void HidServiceMac::TerminatedCallback(void* context, io_iterator_t iterator) {
@@ skipping 66 matching lines @@
   return new HidDeviceInfo(
       entry_id, GetHidIntProperty(hid_device, CFSTR(kIOHIDVendorIDKey)),
       GetHidIntProperty(hid_device, CFSTR(kIOHIDProductIDKey)),
       GetHidStringProperty(hid_device, CFSTR(kIOHIDProductKey)),
       GetHidStringProperty(hid_device, CFSTR(kIOHIDSerialNumberKey)),
       kHIDBusTypeUSB,  // TODO(reillyg): Detect Bluetooth. crbug.com/443335
       report_descriptor);
 }
 
 }  // namespace device