Eliminate ApiResourceEventNotifier.

chrome/browser/extensions/api/usb/usb_api.cc

 // Copyright (c) 2012 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 "chrome/browser/extensions/api/usb/usb_api.h"
 
 #include <string>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 277 matching lines @@
   parameters_ = FindDevices::Params::Create(*args_);
   EXTENSION_FUNCTION_VALIDATE(parameters_.get());
   return true;
 }
 
 void UsbFindDevicesFunction::AsyncWorkStart() {
   scoped_ptr<base::ListValue> result(new base::ListValue());
 
   if (device_for_test_) {
     UsbDeviceResource* const resource = new UsbDeviceResource(
-        extension_->id(), NULL, device_for_test_);
+        extension_->id(),
+        device_for_test_);
 
     Device device;
     result->Append(PopulateDevice(manager_->Add(resource), 0, 0));
     SetResult(result.release());
     AsyncWorkCompleted();
     return;
   }
 
   const uint16_t vendor_id = parameters_->options.vendor_id;
   const uint16_t product_id = parameters_->options.product_id;
@@ skipping 11 matching lines @@
     LOG(WARNING) << "Could not get UsbService for active profile.";
     CompleteWithError(kErrorNoDevice);
     return;
   }
 
   vector<scoped_refptr<UsbDevice> > devices;
   service->FindDevices(vendor_id, product_id, &devices);
   for (size_t i = 0; i < devices.size(); ++i) {
     UsbDevice* const device = devices[i];
     UsbDeviceResource* const resource = new UsbDeviceResource(
-        extension_->id(), NULL, device);
+        extension_->id(), device);
 
     Device js_device;
     result->Append(PopulateDevice(manager_->Add(resource),
                                   vendor_id,
                                   product_id));
   }
 
   SetResult(result.release());
   AsyncWorkCompleted();
 }
@@ skipping 264 matching lines @@
     CompleteWithError(kErrorNoDevice);
     return;
   }
 
   device->device()->IsochronousTransfer(direction, generic_transfer.endpoint,
       buffer, size, transfer.packets, transfer.packet_length, 0, base::Bind(
           &UsbIsochronousTransferFunction::OnCompleted, this));
 }
 
 }  // namespace extensions