Maintaing the proper order of initialization WeakPtrFactory

base/task/cancelable_task_tracker.cc

Index: base/task/cancelable_task_tracker.cc
diff --git a/base/task/cancelable_task_tracker.cc b/base/task/cancelable_task_tracker.cc
index 801223e2806cf4d189b0661be7616017ea8183f8..b6e4b6ac4dedfd80d546deca1fe3798a7106cfc9 100644
--- a/base/task/cancelable_task_tracker.cc
+++ b/base/task/cancelable_task_tracker.cc
@@ -60,7 +60,7 @@ namespace base {
 const CancelableTaskTracker::TaskId CancelableTaskTracker::kBadTaskId = 0;
 
 CancelableTaskTracker::CancelableTaskTracker()
-    : weak_factory_(this), next_id_(1) {}
+    : next_id_(1),weak_factory_(this) {}
 
 CancelableTaskTracker::~CancelableTaskTracker() {
   DCHECK(thread_checker_.CalledOnValidThread());