Move WeakPtrFactory to the end of AsyncHandleWaiter

ipc/mojo/async_handle_waiter.cc

Index: ipc/mojo/async_handle_waiter.cc
diff --git a/ipc/mojo/async_handle_waiter.cc b/ipc/mojo/async_handle_waiter.cc
index d8455ee950c27d6ba991a719159c8ca8d7b3bc85..cf908a71e4dc8242f96b320d50532ff0b88f745b 100644
--- a/ipc/mojo/async_handle_waiter.cc
+++ b/ipc/mojo/async_handle_waiter.cc
@@ -51,10 +51,10 @@ class AsyncHandleWaiter::Context
 };
 
 AsyncHandleWaiter::AsyncHandleWaiter(base::Callback<void(MojoResult)> callback)
-    : weak_factory_(this),
-      context_(new Context(base::MessageLoop::current()->task_runner(),
-                           weak_factory_.GetWeakPtr())),
-      callback_(callback) {
+    : callback_(callback),
+      weak_factory_(this) {
+  context_ = new Context(base::MessageLoop::current()->task_runner(),
+                         weak_factory_.GetWeakPtr());
 }
 
 AsyncHandleWaiter::~AsyncHandleWaiter() {