chrome: Use base::MessageLoop. (Part 3)

chrome/browser/chromeos/xinput_hierarchy_changed_event_listener.h

Index: chrome/browser/chromeos/xinput_hierarchy_changed_event_listener.h
diff --git a/chrome/browser/chromeos/xinput_hierarchy_changed_event_listener.h b/chrome/browser/chromeos/xinput_hierarchy_changed_event_listener.h
index 64b76db8d29a682115b0ac42b3424264a0321b03..597a4bacf36cbc27552f7cbacaaafb418927bb33 100644
--- a/chrome/browser/chromeos/xinput_hierarchy_changed_event_listener.h
+++ b/chrome/browser/chromeos/xinput_hierarchy_changed_event_listener.h
@@ -18,7 +18,8 @@ namespace chromeos {
 // which is sent to Chrome when X detects a system or USB keyboard (or mouse),
 // then tells X to change the current XKB keyboard layout. Start by just calling
 // instance() to get it going.
-class XInputHierarchyChangedEventListener : public MessageLoopForUI::Observer {
+class XInputHierarchyChangedEventListener :
+    public base::MessageLoopForUI::Observer {
  public:
   static XInputHierarchyChangedEventListener* GetInstance();