Revert 110235 - chrome: Remove 14 exit time destructors and 2 static initializers.

chrome/browser/metrics/thread_watcher.h

Index: chrome/browser/metrics/thread_watcher.h
===================================================================
--- chrome/browser/metrics/thread_watcher.h	(revision 110237)
+++ chrome/browser/metrics/thread_watcher.h	(working copy)
@@ -462,7 +462,7 @@
   virtual ~WatchDogThread();
 
   // Callable on any thread.  Returns whether you're currently on a
-  // WatchDogThread.
+  // watchdog_thread_.
   static bool CurrentlyOnWatchDogThread();
 
   // These are the same methods in message_loop.h, but are guaranteed to either
@@ -486,6 +486,11 @@
       const base::Closure& task,
       int64 delay_ms);
 
+  // This lock protects watchdog_thread_.
+  static base::Lock lock_;
+
+  static WatchDogThread* watchdog_thread_;  // The singleton of this class.
+
   DISALLOW_COPY_AND_ASSIGN(WatchDogThread);
 };