Remove extra call to UsbDeviceHandle::Close in chrome.usb.closeDevice.

extensions/browser/api/usb/usb_api.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_api.h"
 
 #include <string>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 922 matching lines @@
   EXTENSION_FUNCTION_VALIDATE(parameters_.get());
   return true;
 }
 
 void UsbCloseDeviceFunction::AsyncWorkStart() {
   scoped_refptr<UsbDeviceHandle> device_handle =
       GetDeviceHandleOrCompleteWithError(parameters_->handle);
   if (!device_handle.get())
     return;
 
-  device_handle->Close();
+  // The device handle is closed when the resource is destroyed.
   RemoveUsbDeviceResource(parameters_->handle.handle);
   AsyncWorkCompleted();
 }
 
 UsbClaimInterfaceFunction::UsbClaimInterfaceFunction() {
 }
 
 UsbClaimInterfaceFunction::~UsbClaimInterfaceFunction() {
 }
 
@@ skipping 315 matching lines @@
     SetResult(new base::FundamentalValue(false));
     CompleteWithError(kErrorResetDevice);
     return;
   }
 
   SetResult(new base::FundamentalValue(true));
   AsyncWorkCompleted();
 }
 
 }  // namespace extensions