Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

base/prefs/public/pref_member.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.
 //
 // A helper class that stays in sync with a preference (bool, int, real,
 // string or filepath).  For example:
 //
 // class MyClass {
 //  public:
 //   MyClass(PrefService* prefs) {
@@ skipping 270 matching lines @@
 
   mutable scoped_refptr<Internal> internal_;
 
   DISALLOW_COPY_AND_ASSIGN(PrefMember);
 };
 
 // Declaration of template specialization need to be repeated here
 // specifically for each specialization (rather than just once above)
 // or at least one of our compilers won't be happy in all cases.
 // Specifically, it was failing on ChromeOS with a complaint about
-// PrefMember<FilePath>::UpdateValueInternal not being defined when
+// PrefMember<base::FilePath>::UpdateValueInternal not being defined when

[Mattias Nissler (ping if slow), 2013/02/06 17:53:33]

unrelated changes?

[Jói, 2013/02/07 14:52:32]

These were to fix a compilation snafu after a merge, but were unnecessary it
turns out. Removed from this change.

 // built in a chroot with the following parameters:
 //
 // FEATURES="noclean nostrip" USE="-chrome_debug -chrome_remoting
 // -chrome_internal -chrome_pdf component_build"
 // ~/trunk/goma/goma-wrapper cros_chrome_make --board=${BOARD}
 // --install --runhooks
 
 template <>
 BASE_PREFS_EXPORT void PrefMember<bool>::UpdatePref(const bool& value);
 
@@ skipping 17 matching lines @@
 
 template <>
 BASE_PREFS_EXPORT void PrefMember<std::string>::UpdatePref(
     const std::string& value);
 
 template <>
 BASE_PREFS_EXPORT bool PrefMember<std::string>::Internal::UpdateValueInternal(
     const Value& value) const;
 
 template <>
-BASE_PREFS_EXPORT void PrefMember<FilePath>::UpdatePref(const FilePath& value);
+BASE_PREFS_EXPORT void PrefMember<base::FilePath>::UpdatePref(
+    const base::FilePath& value);
 
 template <>
-BASE_PREFS_EXPORT bool PrefMember<FilePath>::Internal::UpdateValueInternal(
+BASE_PREFS_EXPORT bool
+PrefMember<base::FilePath>::Internal::UpdateValueInternal(
     const Value& value) const;
 
 template <>
 BASE_PREFS_EXPORT void PrefMember<std::vector<std::string> >::UpdatePref(
     const std::vector<std::string>& value);
 
 template <>
 BASE_PREFS_EXPORT bool
 PrefMember<std::vector<std::string> >::Internal::UpdateValueInternal(
     const Value& value) const;
 
 typedef PrefMember<bool> BooleanPrefMember;
 typedef PrefMember<int> IntegerPrefMember;
 typedef PrefMember<double> DoublePrefMember;
 typedef PrefMember<std::string> StringPrefMember;
-typedef PrefMember<FilePath> FilePathPrefMember;
+typedef PrefMember<base::FilePath> FilePathPrefMember;
 // This preference member is expensive for large string arrays.
 typedef PrefMember<std::vector<std::string> > StringListPrefMember;
 
 #endif  // BASE_PREFS_PUBLIC_PREF_MEMBER_H_