Add timeout to the MessageLoop in FilePathWatcherTest

base/files/file_path_watcher_unittest.cc

Index: base/files/file_path_watcher_unittest.cc
diff --git a/base/files/file_path_watcher_unittest.cc b/base/files/file_path_watcher_unittest.cc
index 6bfa71f0545c430dd094622587cba2aff566cf60..a40e4858b4bea7d70a0f25896d3d162dbeafa329 100644
--- a/base/files/file_path_watcher_unittest.cc
+++ b/base/files/file_path_watcher_unittest.cc
@@ -196,6 +196,10 @@ class FilePathWatcherTest : public testing::Test {
 
   bool WaitForEvents() WARN_UNUSED_RESULT {
     collector_->Reset();
+    // Make sure we timeout if we don't get notified.
+    loop_.PostDelayedTask(FROM_HERE,
+                          MessageLoop::QuitWhenIdleClosure(),
+                          TestTimeouts::action_timeout());
     RunLoop().Run();
     return collector_->Success();
   }