Remove implementation of Panels on OSes other than ChromeOS.

chrome/browser/ui/panels/test_panel_active_state_observer.cc

Index: chrome/browser/ui/panels/test_panel_active_state_observer.cc
diff --git a/chrome/browser/ui/panels/test_panel_active_state_observer.cc b/chrome/browser/ui/panels/test_panel_active_state_observer.cc
deleted file mode 100644
index 05143c6c83a8fe131f1a12f4a97d28490a054e4c..0000000000000000000000000000000000000000
--- a/chrome/browser/ui/panels/test_panel_active_state_observer.cc
+++ /dev/null
@@ -1,25 +0,0 @@
-// 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_active_state_observer.h"
-
-#include "chrome/browser/chrome_notification_types.h"
-#include "chrome/browser/ui/panels/panel.h"
-#include "content/public/browser/notification_source.h"
-
-PanelActiveStateObserver::PanelActiveStateObserver(
-    Panel* panel,
-    bool expect_active)
-    : TestPanelNotificationObserver(
-        chrome::NOTIFICATION_PANEL_CHANGED_ACTIVE_STATUS,
-        content::Source<Panel>(panel)),
-      panel_(panel),
-      expect_active_(expect_active) {
-}
-
-PanelActiveStateObserver::~PanelActiveStateObserver() {}
-
-bool PanelActiveStateObserver::AtExpectedState() {
-  return panel_->IsActive() == expect_active_;
-}