No longer register app window placement preference keys on the fly.

base/prefs/pref_service.cc

Index: base/prefs/pref_service.cc
diff --git a/base/prefs/pref_service.cc b/base/prefs/pref_service.cc
index 65605c5f8e6d346f1d10f82b3a1dc76b08e989a9..54a9b65f40ec87246e32845ca839905c6f831f22 100644
--- a/base/prefs/pref_service.cc
+++ b/base/prefs/pref_service.cc
@@ -554,3 +554,13 @@ const base::Value* PrefService::GetPreferenceValue(
 
   return NULL;
 }
+
+scoped_ptr<base::DictionaryValue> PrefService::GetBrowserDictionary() const {
+  const base::Value* browser_value = NULL;
+  if (!user_pref_store_->GetValue("browser", &browser_value))
+    return scoped_ptr<base::DictionaryValue>();
+  const base::DictionaryValue* browser_dict = NULL;
+  if (!browser_value->GetAsDictionary(&browser_dict))
+    return scoped_ptr<base::DictionaryValue>();
+  return make_scoped_ptr(browser_dict->DeepCopy());
+}