base: Add three helper functions to Values API.

chrome/browser/extensions/extension_prefs.cc

Index: chrome/browser/extensions/extension_prefs.cc
diff --git a/chrome/browser/extensions/extension_prefs.cc b/chrome/browser/extensions/extension_prefs.cc
index 776273ee31e5077b9b39769eb66f9037591239bf..96f86475ce5f9a5ede666d215e99fed00d8d9bc9 100644
--- a/chrome/browser/extensions/extension_prefs.cc
+++ b/chrome/browser/extensions/extension_prefs.cc
@@ -613,8 +613,7 @@ void ExtensionPrefs::UpdateBlacklist(
   std::set<std::string>::const_iterator set_itr = blacklist_set.begin();
   for (; set_itr != blacklist_set.end(); ++set_itr) {
     if (used_id_set.find(*set_itr) == used_id_set.end()) {
-      UpdateExtensionPref(*set_itr, kPrefBlacklist,
-                          Value::CreateBooleanValue(true));
+      UpdateExtensionPref(*set_itr, kPrefBlacklist, base::TrueValue());
     }
   }
   for (unsigned int i = 0; i < remove_pref_ids.size(); ++i) {
@@ -1367,8 +1366,7 @@ bool ExtensionPrefs::WasAppDraggedByUser(const std::string& extension_id) {
 }
 
 void ExtensionPrefs::SetAppDraggedByUser(const std::string& extension_id) {
-  UpdateExtensionPref(extension_id, kPrefUserDraggedApp,
-                      Value::CreateBooleanValue(true));
+  UpdateExtensionPref(extension_id, kPrefUserDraggedApp, base::TrueValue());
 }
 
 void ExtensionPrefs::SetUpdateUrlData(const std::string& extension_id,