Move base/prefs to components/prefs

base/prefs/pref_observer.h

Index: base/prefs/pref_observer.h
diff --git a/base/prefs/pref_observer.h b/base/prefs/pref_observer.h
index 5d8f5b63dc3c9cb363a546ee10ddb92787765937..df5d1af1ed824d5f2afc34789b112ae73ab35a7c 100644
--- a/base/prefs/pref_observer.h
+++ b/base/prefs/pref_observer.h
@@ -2,20 +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_PREF_OBSERVER_H_
-#define BASE_PREFS_PREF_OBSERVER_H_
-
-#include <string>
-
-class PrefService;
-
-// Used internally to the Prefs subsystem to pass preference change
-// notifications between PrefService, PrefNotifierImpl and
-// PrefChangeRegistrar.
-class PrefObserver {
- public:
-  virtual void OnPreferenceChanged(PrefService* service,
-                                   const std::string& pref_name) = 0;
-};
-
-#endif  // BASE_PREFS_PREF_OBSERVER_H_
+// TODO(brettw) remove this forwarding header when prefs is completely moved to
+// components.
+#include "components/prefs/pref_observer.h"