Fix BrowserActionsBarBrowserTest.OverflowedBrowserActionPopupTestRemoval in ASan with new libc++.

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

Index: chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm
diff --git a/chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm b/chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm
index e492bdb763f01dbc9ba333ea2d9dc662925ceaee..6c1e1b5d0e3140fa009eb04916c23d87f3e442ca 100644
--- a/chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm
+++ b/chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm
@@ -513,6 +513,8 @@ void ToolbarActionsBarBridge::ShowToolbarActionBubble(
   base::scoped_nsobject<BrowserActionButton> button(
       [[self buttonForId:action->GetId()] retain]);
 
+  [button hidePopup];
+
   // Note: We remove the button from the view and the buttons list first because
   // destroying it (or calling -onRemoved) can cause redraws, and we don't want
   // to include it when the view is gone.