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

base/metrics/stats_table.cc

Index: base/metrics/stats_table.cc
diff --git a/base/metrics/stats_table.cc b/base/metrics/stats_table.cc
index dede1e4f0552d760f5206d9687864c2ba0884889..9585863089e05f04579514481533b9ead4eb070f 100644
--- a/base/metrics/stats_table.cc
+++ b/base/metrics/stats_table.cc
@@ -431,8 +431,8 @@ int* StatsTable::FindLocation(const char* name) {
   // Get the slot for this thread.  Try to register
   // it if none exists.
   int slot = table->GetSlot();
-  if (!slot && !(slot = table->RegisterThread("")))
-      return NULL;
+  if (!slot && !(slot = table->RegisterThread(std::string())))
+    return NULL;
 
   // Find the counter id for the counter.
   std::string str_name(name);