Fix WeakPtrFactory member ordering in chrome/browser

chrome/browser/io_thread.h

Index: chrome/browser/io_thread.h
diff --git a/chrome/browser/io_thread.h b/chrome/browser/io_thread.h
index 419b458c1cc32b7746d402034e22d0b4a75e677f..66e5772786876e25dcc1d42955615b0939dac933 100644
--- a/chrome/browser/io_thread.h
+++ b/chrome/browser/io_thread.h
@@ -459,10 +459,10 @@ class IOThread : public content::BrowserThreadDelegate {
   // True if SPDY is disabled by policy.
   bool is_spdy_disabled_by_policy_;
 
-  base::WeakPtrFactory<IOThread> weak_factory_;
-
   const base::TimeTicks creation_time_;
 
+  base::WeakPtrFactory<IOThread> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(IOThread);
 };