Manage HidService lifetime in DeviceClient implementations.

device/hid/hid_service_linux.cc

Index: device/hid/hid_service_linux.cc
diff --git a/device/hid/hid_service_linux.cc b/device/hid/hid_service_linux.cc
index e6e09f2829f758599d828f1e055915cbf727e20d..ec36b35385ecbc69ac4c08998b4e0b091932bb47 100644
--- a/device/hid/hid_service_linux.cc
+++ b/device/hid/hid_service_linux.cc
@@ -212,6 +212,10 @@ HidServiceLinux::HidServiceLinux(
       FROM_HERE, base::Bind(&FileThreadHelper::Start, base::Passed(&helper)));
 }
 
+HidServiceLinux::~HidServiceLinux() {
+  file_task_runner_->DeleteSoon(FROM_HERE, helper_);
+}
+
 void HidServiceLinux::Connect(const HidDeviceId& device_id,
                               const ConnectCallback& callback) {
   DCHECK(thread_checker_.CalledOnValidThread());
@@ -241,10 +245,6 @@ void HidServiceLinux::Connect(const HidDeviceId& device_id,
 #endif  // defined(OS_CHROMEOS)
 }
 
-HidServiceLinux::~HidServiceLinux() {
-  file_task_runner_->DeleteSoon(FROM_HERE, helper_);
-}
-
 #if defined(OS_CHROMEOS)
 
 // static