Provide a callback for Component Updater OnDemand calls.

chrome/browser/plugins/plugin_observer.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/plugins/plugin_observer.h"
 
 #include <utility>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
@@ skipping 399 matching lines @@
   NOTREACHED();
 #endif  // defined(ENABLE_PLUGIN_INSTALLATION)
 }
 
 void PluginObserver::OnBlockedComponentUpdatedPlugin(
     int placeholder_id,
     const std::string& identifier) {
   component_observers_[placeholder_id] =
       base::MakeUnique<ComponentObserver>(this, placeholder_id, identifier);
   g_browser_process->component_updater()->GetOnDemandUpdater().OnDemandUpdate(
-      identifier);
+      identifier,
+      component_updater::ComponentUpdateService::CompletionCallback());
 }
 
 void PluginObserver::RemoveComponentObserver(int placeholder_id) {
   auto it = component_observers_.find(placeholder_id);
   DCHECK(it != component_observers_.end());
   component_observers_.erase(it);
 }
 
 #if defined(ENABLE_PLUGIN_INSTALLATION)
 void PluginObserver::OnRemovePluginPlaceholderHost(int placeholder_id) {
@@ skipping 29 matching lines @@
       IDR_INFOBAR_PLUGIN_CRASHED,
 #if !defined(OS_MACOSX) && !defined(OS_ANDROID)
       gfx::VectorIconId::EXTENSION_CRASHED,
 #else
       gfx::VectorIconId::VECTOR_ICON_NONE,
 #endif
       l10n_util::GetStringFUTF16(IDS_PLUGIN_INITIALIZATION_ERROR_PROMPT,
                                  plugin_name),
       true);
 }