Move ash/system/web_notification message_center to ui/

ui/message_center/message_center_export.h

Index: ui/message_center/message_center_export.h
diff --git a/ui/message_center/message_center_export.h b/ui/message_center/message_center_export.h
new file mode 100644
index 0000000000000000000000000000000000000000..4cacb2feb8f7f9c17c3c21edb86ac610e80742d0
--- /dev/null
+++ b/ui/message_center/message_center_export.h
@@ -0,0 +1,32 @@
+// 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.
+
+#ifndef UI_MESSAGE_CENTER_MESSAGE_CENTER_EXPORT_H_
+#define UI_MESSAGE_CENTER_MESSAGE_CENTER_EXPORT_H_
+
+// Defines MESSAGE_CENTER_EXPORT so that functionality implemented by the
+// message_center module can be exported to consumers.
+
+#if defined(COMPONENT_BUILD)
+#if defined(WIN32)
+
+#if defined(MESSAGE_CENTER_IMPLEMENTATION)
+#define MESSAGE_CENTER_EXPORT __declspec(dllexport)
+#else
+#define MESSAGE_CENTER_EXPORT __declspec(dllimport)
+#endif  // defined(MESSAGE_CENTER_IMPLEMENTATION)
+
+#else  // defined(WIN32)
+#if defined(MESSAGE_CENTER_IMPLEMENTATION)
+#define MESSAGE_CENTER_EXPORT __attribute__((visibility("default")))
+#else
+#define MESSAGE_CENTER_EXPORT
+#endif
+#endif
+
+#else  // defined(COMPONENT_BUILD)
+#define MESSAGE_CENTER_EXPORT
+#endif
+
+#endif  // UI_MESSAGE_CENTER_MESSAGE_CENTER_EXPORT_H_