clang/win: Fix warnings to prepare for building without -Wno-reorder.

components/browser_watcher/window_hang_monitor_win.cc

Index: components/browser_watcher/window_hang_monitor_win.cc
diff --git a/components/browser_watcher/window_hang_monitor_win.cc b/components/browser_watcher/window_hang_monitor_win.cc
index a3ca17b097e034467f06065af61e2b9ffa2bea1c..964a6f76f4620a56aa2d2d4a557d1bec65b63ec5 100644
--- a/components/browser_watcher/window_hang_monitor_win.cc
+++ b/components/browser_watcher/window_hang_monitor_win.cc
@@ -30,10 +30,10 @@ WindowHangMonitor::WindowHangMonitor(base::TimeDelta ping_interval,
                                      base::TimeDelta timeout,
                                      const WindowEventCallback& callback)
     : callback_(callback),
-      outstanding_ping_(nullptr),
-      timer_(false /* don't retain user task */, false /* don't repeat */),
       ping_interval_(ping_interval),
-      hang_timeout_(timeout) {
+      hang_timeout_(timeout),
+      timer_(false /* don't retain user task */, false /* don't repeat */),
+      outstanding_ping_(nullptr) {
 }
 
 WindowHangMonitor::~WindowHangMonitor() {