Make the lazy TLS pointer to UtilityThread into a LeakyLazyInstance.

Try to fix a NULL dereference which is likely caused by the utility thread
living past AtExit.

BUG=272753
R=joi@chromium.org

Review URL: https://chromiumcodereview.appspot.com/23448010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@220043 0039d316-1c4b-4281-b951-d872f2087c98

content/public/utility/utility_thread.cc

@@ -11,8 +11,8 @@ namespace content {
 
 // Keep the global UtilityThread in a TLS slot so it is impossible to access
 // incorrectly from the wrong thread.
-static base::LazyInstance<base::ThreadLocalPointer<UtilityThread> > lazy_tls =
-    LAZY_INSTANCE_INITIALIZER;
+static base::LazyInstance<base::ThreadLocalPointer<UtilityThread> >::Leaky
+    lazy_tls = LAZY_INSTANCE_INITIALIZER;
 
 UtilityThread* UtilityThread::Get() {
   return lazy_tls.Pointer()->Get();