Save the activity on the application instance to ensure we hold a reference. Activities that enable search need to persist.

atom/browser/mac/atom_application.h

@@ -8,6 +8,7 @@
                                            CrAppControlProtocol> {
  @private
   BOOL handlingSendEvent_;
+  NSUserActivity* currentActivity_;
 }
 
 + (AtomApplication*)sharedApplication;
@@ -18,4 +19,8 @@
 // CrAppControlProtocol:
 - (void)setHandlingSendEvent:(BOOL)handlingSendEvent;
 
+- (NSUserActivity*)getCurrentActivity;
+
+- (void)setCurrentActivity:(NSUserActivity*)userActivity;
+
 @end