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

components/prefs/persistent_pref_store.h

 // 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 COMPONENTS_PREFS_PERSISTENT_PREF_STORE_H_
-#define COMPONENTS_PREFS_PERSISTENT_PREF_STORE_H_
+#ifndef BASE_PREFS_PERSISTENT_PREF_STORE_H_
+#define BASE_PREFS_PERSISTENT_PREF_STORE_H_
 
 #include <string>
 
 #include "components/prefs/base_prefs_export.h"
 #include "components/prefs/writeable_pref_store.h"
 
 // This interface is complementary to the PrefStore interface, declaring
 // additional functionality that adds support for setting values and persisting
 // the data to some backing store.
-class COMPONENTS_PREFS_EXPORT PersistentPrefStore : public WriteablePrefStore {
+class BASE_PREFS_EXPORT PersistentPrefStore : public WriteablePrefStore {
  public:
   // Unique integer code for each type of error so we can report them
   // distinctly in a histogram.
   // NOTE: Don't change the explicit values of the enums as it will change the
   // server's meaning of the histogram.
   enum PrefReadError {
     PREF_READ_ERROR_NONE = 0,
     PREF_READ_ERROR_JSON_PARSE = 1,
     PREF_READ_ERROR_JSON_TYPE = 2,
     PREF_READ_ERROR_ACCESS_DENIED = 3,
@@ skipping 40 matching lines @@
   // Schedule a write if there is any lossy data pending. Unlike
   // CommitPendingWrite() this does not immediately sync to disk, instead it
   // triggers an eventual write if there is lossy data pending and if there
   // isn't one scheduled already.
   virtual void SchedulePendingLossyWrites() = 0;
 
  protected:
   ~PersistentPrefStore() override {}
 };
 
-#endif  // COMPONENTS_PREFS_PERSISTENT_PREF_STORE_H_
+#endif  // BASE_PREFS_PERSISTENT_PREF_STORE_H_