Move base/prefs to components/prefs

base/prefs/base_prefs_export.h

Index: base/prefs/base_prefs_export.h
diff --git a/base/prefs/base_prefs_export.h b/base/prefs/base_prefs_export.h
index 3d207db890cfe12c66885054186e93b19ec4cf36..477e1aa124b858ab500d4487cfaf4c0d8af90047 100644
--- a/base/prefs/base_prefs_export.h
+++ b/base/prefs/base_prefs_export.h
@@ -2,28 +2,6 @@
 // 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_
+// TODO(brettw) remove this forwarding header when prefs is completely moved to
+// components.
+#include "components/prefs/base_prefs_export.h"