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

extensions/browser/api/usb/usb_device_resource.cc

Index: extensions/browser/api/usb/usb_device_resource.cc
diff --git a/extensions/browser/api/usb/usb_device_resource.cc b/extensions/browser/api/usb/usb_device_resource.cc
index 347a1a75ca73841683a198d82f963b3d7cc7078c..4825ed5b070aef530bd4ed86c24f504845710a3d 100644
--- a/extensions/browser/api/usb/usb_device_resource.cc
+++ b/extensions/browser/api/usb/usb_device_resource.cc
@@ -37,9 +37,11 @@ UsbDeviceResource::UsbDeviceResource(const std::string& owner_extension_id,
 }
 
 UsbDeviceResource::~UsbDeviceResource() {
-  BrowserThread::PostTask(BrowserThread::FILE,
-                          FROM_HERE,
-                          base::Bind(&UsbDeviceHandle::Close, device_));
+  device_->Close();
+}
+
+bool UsbDeviceResource::IsPersistent() const {
+  return false;
 }
 
 }  // namespace extensions