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

net/socket/transport_client_socket_pool_unittest.cc

Index: net/socket/transport_client_socket_pool_unittest.cc
diff --git a/net/socket/transport_client_socket_pool_unittest.cc b/net/socket/transport_client_socket_pool_unittest.cc
index eba7c26cd1a480ce08da94bdf6bfff89dfa2fbb1..9d95a1b8a01284aed63491ec06f725670520eb32 100644
--- a/net/socket/transport_client_socket_pool_unittest.cc
+++ b/net/socket/transport_client_socket_pool_unittest.cc
@@ -1210,8 +1210,8 @@ TEST_F(TransportClientSocketPoolTest, IPv6FallbackSocketIPv4FinishesFirst) {
   client_socket_factory_.set_client_socket_types(case_types, 2);
 
   // Resolve an AddressList with a IPv6 address first and then a IPv4 address.
-  host_resolver_->rules()->AddIPLiteralRule(
-      "*", "2:abcd::3:4:ff,2.2.2.2", "");
+  host_resolver_->rules()
+      ->AddIPLiteralRule("*", "2:abcd::3:4:ff,2.2.2.2", std::string());
 
   TestCompletionCallback callback;
   ClientSocketHandle handle;
@@ -1255,8 +1255,8 @@ TEST_F(TransportClientSocketPoolTest, IPv6FallbackSocketIPv6FinishesFirst) {
       TransportConnectJob::kIPv6FallbackTimerInMs + 50));
 
   // Resolve an AddressList with a IPv6 address first and then a IPv4 address.
-  host_resolver_->rules()->AddIPLiteralRule(
-      "*", "2:abcd::3:4:ff,2.2.2.2", "");
+  host_resolver_->rules()
+      ->AddIPLiteralRule("*", "2:abcd::3:4:ff,2.2.2.2", std::string());
 
   TestCompletionCallback callback;
   ClientSocketHandle handle;
@@ -1289,8 +1289,8 @@ TEST_F(TransportClientSocketPoolTest, IPv6NoIPv4AddressesToFallbackTo) {
       MockClientSocketFactory::MOCK_DELAYED_CLIENT_SOCKET);
 
   // Resolve an AddressList with only IPv6 addresses.
-  host_resolver_->rules()->AddIPLiteralRule(
-      "*", "2:abcd::3:4:ff,3:abcd::3:4:ff", "");
+  host_resolver_->rules()
+      ->AddIPLiteralRule("*", "2:abcd::3:4:ff,3:abcd::3:4:ff", std::string());
 
   TestCompletionCallback callback;
   ClientSocketHandle handle;
@@ -1323,8 +1323,7 @@ TEST_F(TransportClientSocketPoolTest, IPv4HasNoFallback) {
       MockClientSocketFactory::MOCK_DELAYED_CLIENT_SOCKET);
 
   // Resolve an AddressList with only IPv4 addresses.
-  host_resolver_->rules()->AddIPLiteralRule(
-      "*", "1.1.1.1", "");
+  host_resolver_->rules()->AddIPLiteralRule("*", "1.1.1.1", std::string());
 
   TestCompletionCallback callback;
   ClientSocketHandle handle;