Adjust behavior of control buttons of notifications.

ui/message_center/views/custom_notification_view_unittest.cc

 // Copyright 2016 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 <memory>
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 71 matching lines @@
   int keyboard_event_count_ = 0;
 
   DISALLOW_COPY_AND_ASSIGN(TestCustomView);
 };
 
 class TestContentViewDelegate : public CustomNotificationContentViewDelegate {
  public:
   bool IsCloseButtonFocused() const override { return false; }
   void RequestFocusOnCloseButton() override {}
   bool IsPinned() const override { return false; }
+  void UpdateControlButtonsVisibility() override {}
 };
 
 class TestNotificationDelegate : public NotificationDelegate {
  public:
   TestNotificationDelegate() {}
 
   // NotificateDelegate
   std::unique_ptr<CustomContent> CreateCustomContent() override {
     return base::MakeUnique<CustomContent>(
         base::MakeUnique<TestCustomView>(),
@@ skipping 266 matching lines @@
   text_input_client.set_text_input_type(ui::TEXT_INPUT_TYPE_TEXT);
 
   EXPECT_FALSE(controller()->IsRemoved(notification_id));
   PerformKeyEvents(ui::VKEY_BACK);
   EXPECT_FALSE(controller()->IsRemoved(notification_id));
 
   input_method->SetFocusedTextInputClient(nullptr);
 }
 
 }  // namespace message_center