Revert of Move base/prefs to components/prefs

components/prefs/pref_registry.h

Index: components/prefs/pref_registry.h
diff --git a/components/prefs/pref_registry.h b/components/prefs/pref_registry.h
deleted file mode 100644
index 7e141d8b7e5d0f5eaf6c4a8147aa9df2a2422190..0000000000000000000000000000000000000000
--- a/components/prefs/pref_registry.h
+++ /dev/null
@@ -1,89 +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_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 "base/prefs/base_prefs_export.h"
-#include "base/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 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.
-
-    // This marks the pref as "lossy". There is no strict time guarantee on when
-    // a lossy pref will be persisted to permanent storage when it is modified.
-    LOSSY_PREF = 1 << 8,
-  };
-
-  typedef PrefValueMap::const_iterator const_iterator;
-  typedef base::hash_map<std::string, uint32_t> PrefRegistrationFlagsMap;
-
-  PrefRegistry();
-
-  // Retrieve the set of registration flags for the given preference. The return
-  // value is a bitmask of PrefRegistrationFlags.
-  uint32_t GetRegistrationFlags(const std::string& pref_name) const;
-
-  // Gets the registered defaults.
-  scoped_refptr<PrefStore> defaults();
-
-  // Allows iteration over defaults.
-  const_iterator begin() const;
-  const_iterator end() const;
-
-  // Changes the default value for a preference. Takes ownership of |value|.
-  //
-  // |pref_name| must be a previously registered preference.
-  void SetDefaultPrefValue(const std::string& pref_name, base::Value* value);
-
- protected:
-  friend class base::RefCounted<PrefRegistry>;
-  virtual ~PrefRegistry();
-
-  // Used by subclasses to register a default value and registration flags for
-  // a preference. |flags| is a bitmask of |PrefRegistrationFlags|.
-  void RegisterPreference(const std::string& path,
-                          base::Value* default_value,
-                          uint32_t flags);
-
-  scoped_refptr<DefaultPrefStore> defaults_;
-
-  // A map of pref name to a bitmask of PrefRegistrationFlags.
-  PrefRegistrationFlagsMap registration_flags_;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(PrefRegistry);
-};
-
-#endif  // BASE_PREFS_PREF_REGISTRY_H_