Rewrite std::string("") to std::string(), Linux edition.

chrome/browser/extensions/extension_test_message_listener.cc

Index: chrome/browser/extensions/extension_test_message_listener.cc
diff --git a/chrome/browser/extensions/extension_test_message_listener.cc b/chrome/browser/extensions/extension_test_message_listener.cc
index 90aa01affc5383407f2492c81dbcaa11ade82f1d..e892ba170726325004fee2004cc29b865680c5a0 100644
--- a/chrome/browser/extensions/extension_test_message_listener.cc
+++ b/chrome/browser/extensions/extension_test_message_listener.cc
@@ -17,7 +17,6 @@ ExtensionTestMessageListener::ExtensionTestMessageListener(
       satisfied_(false),
       waiting_(false),
       will_reply_(will_reply),
-      failure_message_(""),
       failed_(false) {
   registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_TEST_MESSAGE,
                  content::NotificationService::AllSources());
@@ -59,7 +58,7 @@ void ExtensionTestMessageListener::Observe(
     satisfied_ = true;
     registrar_.RemoveAll();  // Stop listening for more messages.
     if (!will_reply_) {
-      function_->Reply("");
+      function_->Reply(std::string());
       function_ = NULL;
     }
     if (waiting_) {