Always return false on IsHandlingSendingEvent

headless/lib/browser/headless_shell_application_mac.mm

Index: headless/lib/browser/headless_shell_application_mac.mm
diff --git a/headless/lib/browser/headless_shell_application_mac.mm b/headless/lib/browser/headless_shell_application_mac.mm
index fa8e87a9328109c83a1b8d945049af34c5a2bd61..12c37957b2a186902b7a31dd03cb918d5a2f86a5 100644
--- a/headless/lib/browser/headless_shell_application_mac.mm
+++ b/headless/lib/browser/headless_shell_application_mac.mm
@@ -9,9 +9,8 @@
 @implementation HeadlessShellCrApplication
 
 - (BOOL)isHandlingSendEvent {
-  // The CrAppProtocol must return true if [NSApplication sendEvent:] is
-  // currently on the stack. seee |CrAppProtocol| in |MessagePumpMac|.
-  return true;
+  // Since headless mode is non-interactive, always return false.
+  return false;
 }
 
 @end