Corresponding change in Pepper since EnumerateDevices contract is changed.

content/renderer/pepper/pepper_device_enumeration_event_handler.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 "content/renderer/pepper/pepper_device_enumeration_event_handler.h"
 
 #include "base/logging.h"
 #include "ppapi/shared_impl/ppb_device_ref_shared.h"
 
 namespace content {
@@ skipping 20 matching lines @@
   DCHECK(enumerate_callbacks_.empty());
   DCHECK(open_callbacks_.empty());
 }
 
 int PepperDeviceEnumerationEventHandler::RegisterEnumerateDevicesCallback(
     const webkit::ppapi::PluginDelegate::EnumerateDevicesCallback& callback) {
   enumerate_callbacks_[next_id_] = callback;
   return next_id_++;
 }
 
+int PepperDeviceEnumerationEventHandler::UnregisterEnumerateDevicesCallback(
+    int request_id) {
+  enumerate_callbacks_.erase(request_id);
+  return request_id;
+}
+
 int PepperDeviceEnumerationEventHandler::RegisterOpenDeviceCallback(
     const PepperPluginDelegateImpl::OpenDeviceCallback& callback) {
   open_callbacks_[next_id_] = callback;
   return next_id_++;
 }
 
 void PepperDeviceEnumerationEventHandler::OnStreamGenerated(
     int request_id,
     const std::string& label,
     const media_stream::StreamDeviceInfoArray& audio_device_array,
@@ skipping 105 matching lines @@
     return;
   }
 
   PepperPluginDelegateImpl::OpenDeviceCallback callback = iter->second;
   open_callbacks_.erase(iter);
 
   callback.Run(request_id, succeeded, label);
 }
 
 }  // namespace content