Revert of Move base/prefs to components/prefs

components/prefs/base_prefs_export.h

Index: components/prefs/base_prefs_export.h
diff --git a/components/prefs/base_prefs_export.h b/components/prefs/base_prefs_export.h
deleted file mode 100644
index 3d207db890cfe12c66885054186e93b19ec4cf36..0000000000000000000000000000000000000000
--- a/components/prefs/base_prefs_export.h
+++ /dev/null
@@ -1,29 +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.
-
-#ifndef BASE_PREFS_BASE_PREFS_EXPORT_H_
-#define BASE_PREFS_BASE_PREFS_EXPORT_H_
-
-#if defined(COMPONENT_BUILD)
-#if defined(WIN32)
-
-#if defined(BASE_PREFS_IMPLEMENTATION)
-#define BASE_PREFS_EXPORT __declspec(dllexport)
-#else
-#define BASE_PREFS_EXPORT __declspec(dllimport)
-#endif  // defined(BASE_PREFS_IMPLEMENTATION)
-
-#else  // defined(WIN32)
-#if defined(BASE_PREFS_IMPLEMENTATION)
-#define BASE_PREFS_EXPORT __attribute__((visibility("default")))
-#else
-#define BASE_PREFS_EXPORT
-#endif
-#endif
-
-#else  // defined(COMPONENT_BUILD)
-#define BASE_PREFS_EXPORT
-#endif
-
-#endif  // BASE_PREFS_BASE_PREFS_EXPORT_H_