  // is concerned.
  @property(nonatomic, readonly) NSString* subrole;
 diff --git a/content/browser/accessibility/browser_accessibility_cocoa.mm b/content/browser/accessibility/browser_accessibility_cocoa.mm
-index 6b6a156d..a3faece 100644
+index 6b6a156d..b1c080c 100644
 --- a/content/browser/accessibility/browser_accessibility_cocoa.mm
 +++ b/content/browser/accessibility/browser_accessibility_cocoa.mm
 @@ -98,6 +98,7 @@

 
 // Returns a subrole based upon the role.
 - (NSString*) subrole {
@@ -2029,6 +2045,7 @@ - (id)accessibilityAttributeValue:(NSString*)attribute
     return nil;
   }
 

 
   if ([attribute isEqualToString:
       NSAccessibilityBoundsForRangeParameterizedAttribute]) {
@@ -2233,6 +2253,7 @@ - (id)accessibilityAttributeValue:(NSString*)attribute
     return nil;
   }
 
+#ifndef MAS_BUILD
   if ([attribute
           isEqualToString:
               NSAccessibilityLineTextMarkerRangeForTextMarkerParameterizedAttribute]) {
@@ -2248,6 +2269,7 @@ - (id)accessibilityAttributeValue:(NSString*)attribute
         object->GetLineStartBoundary(offset, ui::FORWARDS_DIRECTION);
     return CreateTextMarkerRange(*object, start_offset, *object, end_offset);
   }
+#endif
 
   return nil;
 }
diff --git a/content/browser/accessibility/browser_accessibility_manager_mac.mm b/content/browser/accessibility/browser_accessibility_manager_mac.mm
index 604e420..be0e041 100644
--- a/content/browser/accessibility/browser_accessibility_manager_mac.mm
