Use the location where FileDescriptorWatcher is created to track the libevent handlers

base/message_loop/message_loop_unittest.cc

Index: base/message_loop/message_loop_unittest.cc
diff --git a/base/message_loop/message_loop_unittest.cc b/base/message_loop/message_loop_unittest.cc
index 263442839f764f729b7633cbe02da171b4837ce0..14fe1ee391ccc5c3c87778c6ab6b83d83edefee6 100644
--- a/base/message_loop/message_loop_unittest.cc
+++ b/base/message_loop/message_loop_unittest.cc
@@ -739,7 +739,7 @@ TEST(MessageLoopTest, FileDescriptorWatcherOutlivesMessageLoop) {
   int fd = pipefds[1];
   {
     // Arrange for controller to live longer than message loop.
-    MessageLoopForIO::FileDescriptorWatcher controller;
+    MessageLoopForIO::FileDescriptorWatcher controller(FROM_HERE);
     {
       MessageLoopForIO message_loop;
 
@@ -766,7 +766,7 @@ TEST(MessageLoopTest, FileDescriptorWatcherDoubleStop) {
     // Arrange for message loop to live longer than controller.
     MessageLoopForIO message_loop;
     {
-      MessageLoopForIO::FileDescriptorWatcher controller;
+      MessageLoopForIO::FileDescriptorWatcher controller(FROM_HERE);
 
       QuitDelegate delegate;
       message_loop.WatchFileDescriptor(fd,