Revert of Delete base/prefs and update callers to use components.

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
index e047ad99ab22d3a897926fc5f64d068c3b295b47..3d207db890cfe12c66885054186e93b19ec4cf36 100644
--- a/components/prefs/base_prefs_export.h
+++ b/components/prefs/base_prefs_export.h
@@ -2,28 +2,28 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef COMPONENTS_PREFS_COMPONENTS_PREFS_EXPORT_H_
-#define COMPONENTS_PREFS_COMPONENTS_PREFS_EXPORT_H_
+#ifndef BASE_PREFS_BASE_PREFS_EXPORT_H_
+#define BASE_PREFS_BASE_PREFS_EXPORT_H_
 
 #if defined(COMPONENT_BUILD)
 #if defined(WIN32)
 
-#if defined(COMPONENTS_PREFS_IMPLEMENTATION)
-#define COMPONENTS_PREFS_EXPORT __declspec(dllexport)
+#if defined(BASE_PREFS_IMPLEMENTATION)
+#define BASE_PREFS_EXPORT __declspec(dllexport)
 #else
-#define COMPONENTS_PREFS_EXPORT __declspec(dllimport)
-#endif  // defined(COMPONENTS_PREFS_IMPLEMENTATION)
+#define BASE_PREFS_EXPORT __declspec(dllimport)
+#endif  // defined(BASE_PREFS_IMPLEMENTATION)
 
 #else  // defined(WIN32)
-#if defined(COMPONENTS_PREFS_IMPLEMENTATION)
-#define COMPONENTS_PREFS_EXPORT __attribute__((visibility("default")))
+#if defined(BASE_PREFS_IMPLEMENTATION)
+#define BASE_PREFS_EXPORT __attribute__((visibility("default")))
 #else
-#define COMPONENTS_PREFS_EXPORT
+#define BASE_PREFS_EXPORT
 #endif
 #endif
 
 #else  // defined(COMPONENT_BUILD)
-#define COMPONENTS_PREFS_EXPORT
+#define BASE_PREFS_EXPORT
 #endif
 
-#endif  // COMPONENTS_PREFS_COMPONENTS_PREFS_EXPORT_H_
+#endif  // BASE_PREFS_BASE_PREFS_EXPORT_H_