Allow task tracing in official chrome.

base/threading/worker_pool_win.cc

Index: base/threading/worker_pool_win.cc
diff --git a/base/threading/worker_pool_win.cc b/base/threading/worker_pool_win.cc
index 9f7c19f0021e360c2f4f7c5c3abbc47231c5d0eb..86463c7ec2ccbcf4c94eedd0d98f9db54ad64450 100644
--- a/base/threading/worker_pool_win.cc
+++ b/base/threading/worker_pool_win.cc
@@ -17,9 +17,9 @@ namespace {
 
 DWORD CALLBACK WorkItemCallback(void* param) {
   PendingTask* pending_task = static_cast<PendingTask*>(param);
-  UNSHIPPED_TRACE_EVENT2("task", "WorkItemCallback::Run",
-                         "src_file", pending_task->posted_from.file_name(),
-                         "src_func", pending_task->posted_from.function_name());
+  TRACE_EVENT2("task", "WorkItemCallback::Run",
+               "src_file", pending_task->posted_from.file_name(),
+               "src_func", pending_task->posted_from.function_name());
 
   tracked_objects::TrackedTime start_time =
       tracked_objects::ThreadData::NowForStartOfRun(pending_task->birth_tally);