Make the device::HidService destructor protected.

device/hid/hid_connection_unittest.cc

Index: device/hid/hid_connection_unittest.cc
diff --git a/device/hid/hid_connection_unittest.cc b/device/hid/hid_connection_unittest.cc
index 064720f4c03d9ac2d8a5432bfce483b614d1eafb..5c67edf349e098f3d0947fae31b7a332ae47191f 100644
--- a/device/hid/hid_connection_unittest.cc
+++ b/device/hid/hid_connection_unittest.cc
@@ -73,8 +73,7 @@ class HidConnectionTest : public testing::Test {
     if (!UsbTestGadget::IsTestEnabled()) return;
 
     message_loop_.reset(new base::MessageLoopForIO());
-    service_.reset(HidService::GetInstance(
-        message_loop_->message_loop_proxy()));
+    service_ = HidService::GetInstance(message_loop_->message_loop_proxy());
     ASSERT_TRUE(service_);
 
     test_gadget_ = UsbTestGadget::Claim();
@@ -119,7 +118,7 @@ class HidConnectionTest : public testing::Test {
   }
 
   scoped_ptr<base::MessageLoopForIO> message_loop_;
-  scoped_ptr<HidService> service_;
+  HidService* service_;
   scoped_ptr<UsbTestGadget> test_gadget_;
   HidDeviceId device_id_;
 };