AXRequired should be exposed only when aria-required="true" or required attribute is present

content/browser/accessibility/browser_accessibility_cocoa.mm

Index: content/browser/accessibility/browser_accessibility_cocoa.mm
diff --git a/content/browser/accessibility/browser_accessibility_cocoa.mm b/content/browser/accessibility/browser_accessibility_cocoa.mm
index bb3e2b5245171535fce7dbe98ae5c222e7b4adea..10788e77cbf3aee2ba6865a912a6e05c6abfa449 100644
--- a/content/browser/accessibility/browser_accessibility_cocoa.mm
+++ b/content/browser/accessibility/browser_accessibility_cocoa.mm
@@ -1215,7 +1215,6 @@ NSDictionary* attributeToMethodNameMap = nil;
       NSAccessibilityWindowAttribute,
       @"AXAccessKey",
       @"AXInvalid",
-      @"AXRequired",
       @"AXVisited",
       nil];
 
@@ -1351,6 +1350,11 @@ NSDictionary* attributeToMethodNameMap = nil;
         NSAccessibilityOrientationAttribute, nil]];
   }
 
+  if (GetState(browserAccessibility_, ui::AX_STATE_REQUIRED)) {
+    [ret addObjectsFromArray:[NSArray arrayWithObjects:
+        @"AXRequired", nil]];
+  }
+
   // Title UI Element.
   if (browserAccessibility_->HasIntAttribute(ui::AX_ATTR_TITLE_UI_ELEMENT) ||
       (browserAccessibility_->HasIntListAttribute(ui::AX_ATTR_LABELLEDBY_IDS) &&