Remove implicit conversions from scoped_refptr to T* in extensions/

extensions/browser/api/usb_private/usb_private_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_private/usb_private_api.h"
 
 #include <string>
 #include <vector>
 
 #include "base/memory/ref_counted.h"
@@ skipping 107 matching lines @@
 
 void UsbPrivateGetDeviceInfoFunction::AsyncWorkStart() {
   UsbService* service = UsbService::GetInstance();
   if (!service) {
     CompleteWithError(kErrorInitService);
     return;
   }
 
   scoped_refptr<UsbDevice> device =
       service->GetDeviceById(parameters_->device_id);
-  if (!device) {
+  if (!device.get()) {
     CompleteWithError(kErrorNoDevice);
     return;
   }
 
   usb_private::DeviceInfo device_info;
   device_info.vendor_id = device->vendor_id();
   device_info.product_id = device->product_id();
 
   const char* name = device::UsbIds::GetVendorName(device_info.vendor_id);
   if (name) {
     device_info.vendor_name.reset(new std::string(name));
   }
 
   name = device::UsbIds::GetProductName(device_info.vendor_id,
                                         device_info.product_id);
   if (name) {
     device_info.product_name.reset(new std::string(name));
   }
 
   scoped_refptr<UsbDeviceHandle> device_handle = device->Open();
-  if (!device_handle) {
+  if (!device_handle.get()) {
     CompleteWithError(kErrorOpen);
     return;
   }
 
   base::string16 utf16;
   if (device_handle->GetManufacturer(&utf16)) {
     device_info.manufacturer_string.reset(
         new std::string(base::UTF16ToUTF8(utf16)));
   }
 
   if (device_handle->GetProduct(&utf16)) {
     device_info.product_string.reset(new std::string(base::UTF16ToUTF8(utf16)));
   }
 
   if (device_handle->GetSerial(&utf16)) {
     device_info.serial_string.reset(new std::string(base::UTF16ToUTF8(utf16)));
   }
 
   SetResult(device_info.ToValue().release());
   AsyncWorkCompleted();
 }
 
 }  // namespace extensions