Fix broken PrefService::preference_set() returning not all registered preferences.

chrome/browser/prefs/pref_service.cc

Index: chrome/browser/prefs/pref_service.cc
diff --git a/chrome/browser/prefs/pref_service.cc b/chrome/browser/prefs/pref_service.cc
index 2ab04f89704f96059a3865a67e7bf74fe2f95917..9447875308cda9edab4cac02359b6f564185aedb 100644
--- a/chrome/browser/prefs/pref_service.cc
+++ b/chrome/browser/prefs/pref_service.cc
@@ -356,6 +356,17 @@ bool PrefService::HasPrefPath(const char* path) const {
   return pref && !pref->IsDefaultValue();
 }
 
+DictionaryValue* PrefService::GetPreferenceValues() const {
+  DCHECK(CalledOnValidThread());
+  DictionaryValue* out = new DictionaryValue;
+  DefaultPrefStore::const_iterator i = default_store_->begin();
+  for (; i != default_store_->end(); ++i) {
+    const Value* value = FindPreference(i->first.c_str())->GetValue();
+    out->Set(i->first, value->DeepCopy());
+  }
+  return out;
+}
+
 const PrefService::Preference* PrefService::FindPreference(
     const char* pref_name) const {
   DCHECK(CalledOnValidThread());