Set the background color of notification settings explicitly

ui/message_center/views/notifier_settings_view.cc

 // Copyright (c) 2013 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 "ui/message_center/views/notifier_settings_view.h"
 
 #include <stddef.h>
 
 #include <set>
 #include <string>
@@ skipping 422 matching lines @@
       views::style::CONTEXT_DIALOG_TITLE);
   title_label_->SetHorizontalAlignment(gfx::ALIGN_LEFT);
   title_label_->SetMultiLine(true);
   title_label_->SetBorder(
       views::CreateEmptyBorder(kComputedTitleTopMargin, kTitleMargin,
                                kComputedTitleBottomMargin, kTitleMargin));
 
   AddChildView(title_label_);
 
   scroller_ = new views::ScrollView();
+  scroller_->SetBackgroundColor(kMessageCenterBackgroundColor);
   scroller_->SetVerticalScrollBar(new views::OverlayScrollBar(false));
   scroller_->SetHorizontalScrollBar(new views::OverlayScrollBar(true));
   AddChildView(scroller_);
 
   std::vector<std::unique_ptr<Notifier>> notifiers;
   if (provider_)
     provider_->GetNotifierList(&notifiers);
 
   UpdateContentsView(std::move(notifiers));
 }
@@ skipping 176 matching lines @@
     provider_->SetNotifierEnabled((*iter)->notifier(), (*iter)->checked());
 }
 
 void NotifierSettingsView::OnPerformAction(views::Combobox* combobox) {
   provider_->SwitchToNotifierGroup(combobox->selected_index());
   MessageCenterView* center_view = static_cast<MessageCenterView*>(parent());
   center_view->OnSettingsChanged();
 }
 
 }  // namespace message_center