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

chrome/browser/sync/profile_sync_service_session_unittest.cc

Index: chrome/browser/sync/profile_sync_service_session_unittest.cc
diff --git a/chrome/browser/sync/profile_sync_service_session_unittest.cc b/chrome/browser/sync/profile_sync_service_session_unittest.cc
index 1ee92a6ec5a72ecf2869a11c4c88495fa1e41795..4ed28abc21c09c069f1b3f7c7d827b01301b599d 100644
--- a/chrome/browser/sync/profile_sync_service_session_unittest.cc
+++ b/chrome/browser/sync/profile_sync_service_session_unittest.cc
@@ -85,8 +85,10 @@ class FakeProfileSyncService : public TestProfileSyncService {
   virtual ~FakeProfileSyncService() {}
 
   virtual scoped_ptr<DeviceInfo> GetLocalDeviceInfo() const OVERRIDE {
-    return scoped_ptr<DeviceInfo>(
-        new DeviceInfo("client_name", "", "", sync_pb::SyncEnums::TYPE_WIN));
+    return scoped_ptr<DeviceInfo>(new DeviceInfo("client_name",
+                                                 std::string(),
+                                                 std::string(),
+                                                 sync_pb::SyncEnums::TYPE_WIN));
   }
 };