Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

base/prefs/public/pref_member.h

Index: base/prefs/public/pref_member.h
diff --git a/base/prefs/public/pref_member.h b/base/prefs/public/pref_member.h
index 52a91b5f3ed214dc50c9aa51b6f65c51bee3c089..40cf2725d1c7a523e23aa15d669a7caa88bc6333 100644
--- a/base/prefs/public/pref_member.h
+++ b/base/prefs/public/pref_member.h
@@ -288,7 +288,7 @@ class PrefMember : public subtle::PrefMemberBase {
 // 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
@@ -326,10 +326,12 @@ 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 <>
@@ -345,7 +347,7 @@ 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;