cocoa: hide icon in permission bubble from a11y tree

chrome/browser/ui/cocoa/permission_bubble/permission_bubble_controller.mm

Index: chrome/browser/ui/cocoa/permission_bubble/permission_bubble_controller.mm
diff --git a/chrome/browser/ui/cocoa/permission_bubble/permission_bubble_controller.mm b/chrome/browser/ui/cocoa/permission_bubble/permission_bubble_controller.mm
index 3fff34a49e06baba23eee7e2e188ae34ef2c562f..3c82471808102e4994e0d35bd7cbc7d61f5d630c 100644
--- a/chrome/browser/ui/cocoa/permission_bubble/permission_bubble_controller.mm
+++ b/chrome/browser/ui/cocoa/permission_bubble/permission_bubble_controller.mm
@@ -39,6 +39,7 @@
 #include "content/public/browser/native_web_keyboard_event.h"
 #include "content/public/browser/user_metrics.h"
 #include "skia/ext/skia_utils_mac.h"
+#include "ui/base/cocoa/a11y_util.h"
 #include "ui/base/cocoa/cocoa_base_utils.h"
 #import "ui/base/cocoa/controls/hyperlink_text_view.h"
 #import "ui/base/cocoa/menu_controller.h"
@@ -497,6 +498,7 @@ - (NSView*)labelForRequest:(PermissionRequest*)request {
       setImage:NSImageFromImageSkia(gfx::CreateVectorIcon(
                    request->GetIconId(), 18, gfx::kChromeIconGrey))];
   [permissionIcon setFrameSize:kPermissionIconSize];
+  ui::a11y_util::HideImageFromAccessibilityOrder(permissionIcon);
   [permissionView addSubview:permissionIcon];
 
   base::scoped_nsobject<NSTextField> permissionLabel(