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

components/prefs/pref_registry.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_PREF_REGISTRY_H_
-#define COMPONENTS_PREFS_PREF_REGISTRY_H_
+#ifndef BASE_PREFS_PREF_REGISTRY_H_
+#define BASE_PREFS_PREF_REGISTRY_H_
 
 #include <stdint.h>
 
 #include "base/containers/hash_tables.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "components/prefs/base_prefs_export.h"
 #include "components/prefs/pref_value_map.h"
 
 namespace base {
 class Value;
 }
 
 class DefaultPrefStore;
 class PrefStore;
 
 // Preferences need to be registered with a type and default value
 // before they are used.
 //
 // The way you use a PrefRegistry is that you register all required
 // preferences on it (via one of its subclasses), then pass it as a
 // construction parameter to PrefService.
 //
 // Currently, registrations after constructing the PrefService will
 // also work, but this is being deprecated.
-class COMPONENTS_PREFS_EXPORT PrefRegistry
-    : public base::RefCounted<PrefRegistry> {
+class BASE_PREFS_EXPORT PrefRegistry : public base::RefCounted<PrefRegistry> {
  public:
   // Registration flags that can be specified which impact how the pref will
   // behave or be stored. This will be passed in a bitmask when the pref is
   // registered. Subclasses of PrefRegistry can specify their own flags. Care
   // must be taken to ensure none of these overlap with the flags below.
   enum PrefRegistrationFlags : uint32_t {
     // No flags are specified.
     NO_REGISTRATION_FLAGS = 0,
 
     // The first 8 bits are reserved for subclasses of PrefRegistry to use.
@@ skipping 36 matching lines @@
 
   scoped_refptr<DefaultPrefStore> defaults_;
 
   // A map of pref name to a bitmask of PrefRegistrationFlags.
   PrefRegistrationFlagsMap registration_flags_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PrefRegistry);
 };
 
-#endif  // COMPONENTS_PREFS_PREF_REGISTRY_H_
+#endif  // BASE_PREFS_PREF_REGISTRY_H_