[Extensions UI Mac] Don't let the top-level actions container be first responder

chrome/browser/ui/cocoa/extensions/browser_actions_container_view.mm

Index: chrome/browser/ui/cocoa/extensions/browser_actions_container_view.mm
diff --git a/chrome/browser/ui/cocoa/extensions/browser_actions_container_view.mm b/chrome/browser/ui/cocoa/extensions/browser_actions_container_view.mm
index 4a1de10e5e699e2f19555cf0d758debf279e198e..e3586b6282be0d94915186775662314e8a0ba22b 100644
--- a/chrome/browser/ui/cocoa/extensions/browser_actions_container_view.mm
+++ b/chrome/browser/ui/cocoa/extensions/browser_actions_container_view.mm
@@ -196,7 +196,10 @@ const CGFloat kMinimumContainerWidth = 3.0;
 }
 
 - (BOOL)acceptsFirstResponder {
-  return YES;
+  // The overflow container needs to receive key events to handle in-item
+  // navigation. The top-level container should not become first responder,
+  // allowing focus travel to proceed to the first action.
+  return isOverflow_;
 }
 
 - (void)mouseEntered:(NSEvent*)theEvent {