Refactor app_list_util.h into AppListService abstract base.

chrome/browser/ui/app_list/app_list_service_selector.cc

Index: chrome/browser/ui/app_list/app_list_service_selector.cc
diff --git a/chrome/browser/ui/app_list/app_list_service_selector.cc b/chrome/browser/ui/app_list/app_list_service_selector.cc
new file mode 100644
index 0000000000000000000000000000000000000000..84fd5202fdb095b965d2920d29654c1646a988d2
--- /dev/null
+++ b/chrome/browser/ui/app_list/app_list_service_selector.cc
@@ -0,0 +1,36 @@
+// Copyright 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 "chrome/browser/ui/app_list/app_list_service.h"
+#include "chrome/browser/ui/host_desktop.h"
+
+#if defined(USE_ASH)
+#include "chrome/browser/ui/app_list/app_list_service_ash.h"
+#endif
+
+#if defined(OS_WIN)
+#include "chrome/browser/ui/app_list/app_list_service_win.h"
+#endif
+
+#if defined(OS_MACOSX)
+#include "chrome/browser/ui/app_list/app_list_service_cocoa.h"
+#endif
+
+// static
+AppListService* AppListService::Get() {
+#if defined(USE_ASH) && defined(OS_WIN)
+  if (chrome::GetActiveDesktop() == chrome::HOST_DESKTOP_TYPE_ASH)
+    return AppListServiceAsh::GetInstance();
+#endif
+
+#if defined(OS_WIN)
+  return AppListServiceWin::GetInstance();
+#elif defined(OS_MACOSX)
+  return AppListServiceCocoa::GetInstance();
+#elif defined(OS_CHROMEOS)
+  return AppListServiceAsh::GetInstance();
+#else
+#error "ENABLE_APP_LIST defined, but no controller available"
+#endif
+}