[Coverity] Fix uninitialized member in ctor

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 <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/extensions/api/api_resource_controller.h"
 #include "chrome/browser/extensions/api/usb/usb_device_resource.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/usb/usb_service_factory.h"
 #include "chrome/browser/usb/usb_service.h"
 #include "chrome/common/extensions/api/experimental_usb.h"
 
 namespace BulkTransfer = extensions::api::experimental_usb::BulkTransfer;
 namespace CloseDevice = extensions::api::experimental_usb::CloseDevice;
 namespace ControlTransfer = extensions::api::experimental_usb::ControlTransfer;
 namespace FindDevice = extensions::api::experimental_usb::FindDevice;
 namespace InterruptTransfer =
     extensions::api::experimental_usb::InterruptTransfer;
 using extensions::api::experimental_usb::Device;
 using std::vector;
 
 namespace extensions {
 
-UsbFindDeviceFunction::UsbFindDeviceFunction() {}
+UsbFindDeviceFunction::UsbFindDeviceFunction() : event_notifier_(NULL) {}
 
 UsbFindDeviceFunction::~UsbFindDeviceFunction() {}
 
 bool UsbFindDeviceFunction::Prepare() {
   parameters_ = FindDevice::Params::Create(*args_);
   EXTENSION_FUNCTION_VALIDATE(parameters_.get());
   event_notifier_ = CreateEventNotifier(ExtractSrcId(2));
   return true;
 }
 
@@ skipping 101 matching lines @@
   if (device) {
     device->InterruptTransfer(parameters_->transfer_info);
   }
 }
 
 bool UsbInterruptTransferFunction::Respond() {
   return true;
 }
 
 }  // namespace extensions