Move the number conversions from string_util to a new file....

chrome/browser/sync/engine/syncer_unittest.cc

Index: chrome/browser/sync/engine/syncer_unittest.cc
===================================================================
--- chrome/browser/sync/engine/syncer_unittest.cc	(revision 54340)
+++ chrome/browser/sync/engine/syncer_unittest.cc	(working copy)
@@ -14,6 +14,7 @@
 
 #include "base/callback.h"
 #include "base/scoped_ptr.h"
+#include "base/string_number_conversions.h"
 #include "build/build_config.h"
 #include "chrome/browser/sync/engine/conflict_resolver.h"
 #include "chrome/browser/sync/engine/get_commit_ids_command.h"
@@ -4982,7 +4983,7 @@
   }
 
   void AddRootItemWithPosition(int64 position) {
-    string id = string("ServerId") + Int64ToString(next_update_id_++);
+    string id = string("ServerId") + base::Int64ToString(next_update_id_++);
     string name = "my name is my id -- " + id;
     int revision = next_revision_++;
     mock_server_->AddUpdateDirectory(id, kRootId, name, revision, revision);