Stops using SYSTEM_STATE_INDETERMINATE as it makes radio buttons appear to have a mixed state.

third_party/WebKit/Source/modules/accessibility/AXNodeObject.h

 /*
  * Copyright (C) 2012, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 105 matching lines @@
     bool isProgressIndicator() const override;
     bool isRichlyEditable() const override { return hasContentEditableAttributeSet(); }
     bool isSlider() const override;
     bool isNativeSlider() const override;
 
     // Check object state.
     bool isChecked() const final;
     bool isClickable() const final;
     bool isEnabled() const override;
     AccessibilityExpanded isExpanded() const override;
-    bool isIndeterminate() const final;
     bool isPressed() const final;
     bool isReadOnly() const override;
     bool isRequired() const final;
 
     // Check whether certain properties can be modified.
     bool canSetFocusAttribute() const override;
     bool canSetValueAttribute() const override;
 
     // Properties of static elements.
     RGBA32 colorValue() const final;
@@ skipping 61 matching lines @@
     // Position in set and Size of set
     int posInSet() const override;
     int setSize() const override;
 
     // Aria-owns.
     void computeAriaOwnsChildren(HeapVector<Member<AXObject>>& ownedChildren);
 
 private:
     RawPtrWillBeMember<Node> m_node;
 
+    bool isNativeCheckboxInMixedState() const;
     String textFromDescendants(AXObjectSet& visited) const;
     String nativeTextAlternative(AXObjectSet& visited, AXNameFrom&, AXRelatedObjectVector*, NameSources*, bool* foundTextAlternative) const;
     float stepValueForRange() const;
     AXObject* findChildWithTagName(const HTMLQualifiedName&) const;
     bool isDescendantOfElementType(const HTMLQualifiedName& tagName) const;
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXNodeObject, isAXNodeObject());
 
 } // namespace blink
 
 #endif // AXNodeObject_h