Always return a subrole when the Mac accessibility role is AXList.

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 61e90088ac1271f265e69a03fb15ec2ce2dc191e..232e4827750c76a2d30f5f2412b1878fbc30e6a1 100644
--- a/content/browser/accessibility/browser_accessibility_cocoa.mm
+++ b/content/browser/accessibility/browser_accessibility_cocoa.mm
@@ -847,11 +847,10 @@ NSDictionary* attributeToMethodNameMap = nil;
       browserAccessibility_, ui::AX_ATTR_HTML_TAG);
 
   if (browserAccessibilityRole == ui::AX_ROLE_LIST) {
-    if ([htmlTag isEqualToString:@"ul"] ||
-        [htmlTag isEqualToString:@"ol"]) {
-      return @"AXContentList";
-    } else if ([htmlTag isEqualToString:@"dl"]) {
+    if ([htmlTag isEqualToString:@"dl"]) {
       return @"AXDescriptionList";
+    } else {
+      return @"AXContentList";
     }
   }