Update some uses of Value in chrome/browser to use the base:: namespace.

chrome/browser/chromeos/login/supervised_user_manager_impl.cc

Index: chrome/browser/chromeos/login/supervised_user_manager_impl.cc
diff --git a/chrome/browser/chromeos/login/supervised_user_manager_impl.cc b/chrome/browser/chromeos/login/supervised_user_manager_impl.cc
index 73a161f5359031186afa616085ea2fd38bc51bcc..c975ba004a7e8167940abfef123dbd905adf7150 100644
--- a/chrome/browser/chromeos/login/supervised_user_manager_impl.cc
+++ b/chrome/browser/chromeos/login/supervised_user_manager_impl.cc
@@ -183,7 +183,7 @@ std::string SupervisedUserManagerImpl::GetUserSyncId(const std::string& user_id)
 base::string16 SupervisedUserManagerImpl::GetManagerDisplayName(
     const std::string& user_id) const {
   PrefService* local_state = g_browser_process->local_state();
-  const DictionaryValue* manager_names =
+  const base::DictionaryValue* manager_names =
       local_state->GetDictionary(kManagedUserManagerNames);
   base::string16 result;
   if (manager_names->GetStringWithoutPathExpansion(user_id, &result) &&
@@ -395,12 +395,12 @@ void SupervisedUserManagerImpl::UpdateManagerName(const std::string& manager_id,
     const base::string16& new_display_name) {
   PrefService* local_state = g_browser_process->local_state();
 
-  const DictionaryValue* manager_ids =
+  const base::DictionaryValue* manager_ids =
       local_state->GetDictionary(kManagedUserManagers);
 
   DictionaryPrefUpdate manager_name_update(local_state,
                                            kManagedUserManagerNames);
-  for (DictionaryValue::Iterator it(*manager_ids); !it.IsAtEnd();
+  for (base::DictionaryValue::Iterator it(*manager_ids); !it.IsAtEnd();
       it.Advance()) {
     std::string user_id;
     bool has_manager_id = it.value().GetAsString(&user_id);