Make aura_demo work on Mac

base/run_loop.h

Index: base/run_loop.h
diff --git a/base/run_loop.h b/base/run_loop.h
index 0dce6346e76189b804f6ce7f750497a9e2d9b59b..112bb79169938ba3db241707637167e2372321d5 100644
--- a/base/run_loop.h
+++ b/base/run_loop.h
@@ -27,14 +27,12 @@ class MessagePumpUIApplication;
 class BASE_EXPORT RunLoop {
  public:
   RunLoop();
-#if !defined(OS_MACOSX) && !defined(OS_ANDROID) && \
-    !defined(USE_GTK_MESSAGE_PUMP)
+#if defined(USE_AURA)
   explicit RunLoop(MessageLoop::Dispatcher* dispatcher);
 #endif
   ~RunLoop();
 
-#if !defined(OS_MACOSX) && !defined(OS_ANDROID) && \
-    !defined(USE_GTK_MESSAGE_PUMP)
+#if defined(USE_AURA)
   void set_dispatcher(MessageLoop::Dispatcher* dispatcher) {
     dispatcher_ = dispatcher;
   }
@@ -97,8 +95,7 @@ class BASE_EXPORT RunLoop {
   // Parent RunLoop or NULL if this is the top-most RunLoop.
   RunLoop* previous_run_loop_;
 
-#if !defined(OS_MACOSX) && !defined(OS_ANDROID) && \
-    !defined(USE_GTK_MESSAGE_PUMP)
+#if defined(USE_AURA)
   MessageLoop::Dispatcher* dispatcher_;
 #endif