a11y: Exclude children of nested keyboard accessible controls from a11y tree.

ui/views/widget/native_widget_mac_unittest.mm

Index: ui/views/widget/native_widget_mac_unittest.mm
diff --git a/ui/views/widget/native_widget_mac_unittest.mm b/ui/views/widget/native_widget_mac_unittest.mm
index 0dec9ded50095c597488f9b4f621fe55f2e16cf5..895c1283c9adee9ef4569fc3cf2751472ad15aea 100644
--- a/ui/views/widget/native_widget_mac_unittest.mm
+++ b/ui/views/widget/native_widget_mac_unittest.mm
@@ -652,6 +652,7 @@ TEST_F(NativeWidgetMacTest, AccessibilityIntegration) {
   const base::string16 test_string = base::ASCIIToUTF16("Green");
   views::Label* label = new views::Label(test_string);
   label->SetBounds(0, 0, 100, 100);
+  label->SetFocusBehavior(ClientView::FocusBehavior::ACCESSIBLE_ONLY);
   widget->GetContentsView()->AddChildView(label);
   widget->Show();
 
@@ -661,7 +662,7 @@ TEST_F(NativeWidgetMacTest, AccessibilityIntegration) {
 
   id hit = [widget->GetNativeWindow() accessibilityHitTest:midpoint];
   id title = [hit accessibilityAttributeValue:NSAccessibilityTitleAttribute];
-  EXPECT_NSEQ(title, @"Green");
+  EXPECT_NSEQ(@"Green", title);
 
   widget->CloseNow();
 }