Make the device::HidService destructor protected.

device/hid/hid_connection_unittest.cc

 // Copyright (c) 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 <string>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 55 matching lines @@
 };
 
 }  // namespace
 
 class HidConnectionTest : public testing::Test {
  protected:
   virtual void SetUp() OVERRIDE {
     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();
     ASSERT_TRUE(test_gadget_);
     ASSERT_TRUE(test_gadget_->SetType(UsbTestGadget::HID_ECHO));
 
     device_id_ = kInvalidHidDeviceId;
 
     base::RunLoop run_loop;
     message_loop_->PostDelayedTask(
@@ skipping 24 matching lines @@
           FROM_HERE,
           base::Bind(&HidConnectionTest::FindDevice, base::Unretained(this),
                      done, retries),
           base::TimeDelta::FromMilliseconds(10));
     } else {
       message_loop_->PostTask(FROM_HERE, done);
     }
   }
 
   scoped_ptr<base::MessageLoopForIO> message_loop_;
-  scoped_ptr<HidService> service_;
+  HidService* service_;
   scoped_ptr<UsbTestGadget> test_gadget_;
   HidDeviceId device_id_;
 };
 
 TEST_F(HidConnectionTest, ReadWrite) {
   if (!UsbTestGadget::IsTestEnabled()) return;
 
   scoped_refptr<HidConnection> conn = service_->Connect(device_id_);
   ASSERT_TRUE(conn.get());
 
@@ skipping 13 matching lines @@
     ASSERT_TRUE(read_callback.WaitForResult());
     ASSERT_EQ(9UL, read_callback.size());
     ASSERT_EQ(0, read_callback.buffer()->data()[0]);
     for (int j = 1; j < buffer->size(); ++j) {
       ASSERT_EQ(i + j - 1, read_callback.buffer()->data()[j]);
     }
   }
 }
 
 }  // namespace device