Mark HID and USB device connections as non-persistent API resources.

extensions/browser/api/usb/usb_device_resource.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 "extensions/browser/api/usb/usb_device_resource.h"
 
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 19 matching lines @@
 ApiResourceManager<UsbDeviceResource>::GetFactoryInstance() {
   return g_factory.Pointer();
 }
 
 UsbDeviceResource::UsbDeviceResource(const std::string& owner_extension_id,
                                      scoped_refptr<UsbDeviceHandle> device)
     : ApiResource(owner_extension_id), device_(device) {
 }
 
 UsbDeviceResource::~UsbDeviceResource() {
-  BrowserThread::PostTask(BrowserThread::FILE,
-                          FROM_HERE,
-                          base::Bind(&UsbDeviceHandle::Close, device_));
+  device_->Close();
+}
+
+bool UsbDeviceResource::IsPersistent() const {
+  return false;
 }
 
 }  // namespace extensions