Remove implementation of Panels on OSes other than ChromeOS.

chrome/browser/ui/panels/test_panel_notification_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/ui/panels/test_panel_notification_observer.h"
-
-#include "chrome/browser/chrome_notification_types.h"
-#include "content/public/browser/notification_source.h"
-#include "content/public/test/test_utils.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-TestPanelNotificationObserver::TestPanelNotificationObserver(
-    int notification,
-    const content::NotificationSource& source)
-    : seen_(false),
-      running_(false) {
-  registrar_.Add(this, notification, source);
-}
-
-TestPanelNotificationObserver::~TestPanelNotificationObserver() {}
-
-void TestPanelNotificationObserver::Wait() {
-  if (seen_ || AtExpectedState())
-    return;
-
-  running_ = true;
-  message_loop_runner_ = new content::MessageLoopRunner;
-  message_loop_runner_->Run();
-  EXPECT_TRUE(seen_);
-}
-
-void TestPanelNotificationObserver::Observe(
-    int type,
-    const content::NotificationSource& source,
-    const content::NotificationDetails& details) {
-  if (!running_)
-    return;
-
-  if (AtExpectedState()) {
-    seen_ = true;
-    message_loop_runner_->Quit();
-    running_ = false;
-  }
-}