[Mac] The infobar's top arrow should be hidden while the omnibox popup is shown

chrome/browser/ui/cocoa/infobars/infobar_container_controller.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_COCOA_INFOBARS_INFOBAR_CONTAINER_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_INFOBARS_INFOBAR_CONTAINER_CONTROLLER_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include <memory>
@@ skipping 76 matching lines @@
 // Removes the given infobar.
 - (void)removeInfoBar:(InfoBarCocoa*)infobar;
 
 // Positions the infobar views in the container view and notifies
 // |browser_controller_| that it needs to resize the container view.
 - (void)positionInfoBarsAndRedraw:(BOOL)isAnimating;
 
 // Set the max arrow height of the top infobar.
 - (void)setMaxTopArrowHeight:(NSInteger)height;
 
+// Returns the default max arrow height of the top infobar.
+- (NSInteger)defaultMaxTopArrowHeight;
+
 // The height of all the info bars. Does not include the top arrow.
 - (CGFloat)heightOfInfoBars;
 
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_INFOBARS_INFOBAR_CONTAINER_CONTROLLER_H_