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

dbus/message_unittest.cc

Index: dbus/message_unittest.cc
diff --git a/dbus/message_unittest.cc b/dbus/message_unittest.cc
index 7e4455a8e9e535244352ee03d695f30d66b028b0..383e1c133e7ed616f4d08f469a708d671c90724a 100644
--- a/dbus/message_unittest.cc
+++ b/dbus/message_unittest.cc
@@ -557,7 +557,7 @@ TEST(MessageTest, GetAndSetHeaders) {
   scoped_ptr<dbus::Response> message(dbus::Response::CreateEmpty());
 
   EXPECT_EQ("", message->GetDestination());
-  EXPECT_EQ(dbus::ObjectPath(""), message->GetPath());
+  EXPECT_EQ(dbus::ObjectPath(std::string()), message->GetPath());
   EXPECT_EQ("", message->GetInterface());
   EXPECT_EQ("", message->GetMember());
   EXPECT_EQ("", message->GetErrorName());
@@ -587,7 +587,7 @@ TEST(MessageTest, GetAndSetHeaders) {
 TEST(MessageTest, SetInvalidHeaders) {
   scoped_ptr<dbus::Response> message(dbus::Response::CreateEmpty());
   EXPECT_EQ("", message->GetDestination());
-  EXPECT_EQ(dbus::ObjectPath(""), message->GetPath());
+  EXPECT_EQ(dbus::ObjectPath(std::string()), message->GetPath());
   EXPECT_EQ("", message->GetInterface());
   EXPECT_EQ("", message->GetMember());
   EXPECT_EQ("", message->GetErrorName());
@@ -607,7 +607,7 @@ TEST(MessageTest, SetInvalidHeaders) {
   EXPECT_FALSE(message->SetSender("?!#*"));
 
   EXPECT_EQ("", message->GetDestination());
-  EXPECT_EQ(dbus::ObjectPath(""), message->GetPath());
+  EXPECT_EQ(dbus::ObjectPath(std::string()), message->GetPath());
   EXPECT_EQ("", message->GetInterface());
   EXPECT_EQ("", message->GetMember());
   EXPECT_EQ("", message->GetErrorName());