Call scoped_refptr<T>::get() rather than relying on implicit "operator T*"

base/files/file_path_watcher_linux.cc

Index: base/files/file_path_watcher_linux.cc
diff --git a/base/files/file_path_watcher_linux.cc b/base/files/file_path_watcher_linux.cc
index 84dce887ecf8fe3cd58d4a3dc9c68e527166f7f5..b715d691c9c0362ad0b42e6d77bdb78d63c8f517 100644
--- a/base/files/file_path_watcher_linux.cc
+++ b/base/files/file_path_watcher_linux.cc
@@ -370,7 +370,7 @@ bool FilePathWatcherImpl::Watch(const FilePath& path,
     return false;
   }
 
-  set_message_loop(base::MessageLoopProxy::current());
+  set_message_loop(base::MessageLoopProxy::current().get());
   callback_ = callback;
   target_ = path;
   MessageLoop::current()->AddDestructionObserver(this);