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

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

 /*
  * Copyright (C) 2008, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nuanti Ltd.
  *
  * 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.
@@ skipping 180 matching lines @@
 
 enum AccessibilityState {
     AXBusyState,
     AXCheckedState,
     AXEnabledState,
     AXExpandedState,
     AXFocusableState,
     AXFocusedState,
     AXHaspopupState,
     AXHoveredState,
-    AXIndeterminateState,
     AXInvisibleState,
     AXLinkedState,
     AXMultilineState,
     AXMultiselectableState,
     AXOffscreenState,
     AXPressedState,
     AXProtectedState,
     AXReadonlyState,
     AXRequiredState,
     AXSelectableState,
@@ skipping 412 matching lines @@
     bool isWebArea() const { return roleValue() == WebAreaRole; }
 
     // Check object state.
     virtual bool isChecked() const { return false; }
     virtual bool isClickable() const;
     virtual bool isCollapsed() const { return false; }
     virtual bool isEnabled() const { return false; }
     virtual AccessibilityExpanded isExpanded() const { return ExpandedUndefined; }
     virtual bool isFocused() const { return false; }
     virtual bool isHovered() const { return false; }
-    virtual bool isIndeterminate() const { return false; }
     virtual bool isLinked() const { return false; }
     virtual bool isLoaded() const { return false; }
     virtual bool isMultiSelectable() const { return false; }
     virtual bool isOffScreen() const { return false; }
     virtual bool isPressed() const { return false; }
     virtual bool isReadOnly() const { return false; }
     virtual bool isRequired() const { return false; }
     virtual bool isSelected() const { return false; }
     virtual bool isSelectedOptionActive() const { return false; }
     virtual bool isVisible() const { return true; }
@@ skipping 334 matching lines @@
 #define DEFINE_AX_OBJECT_TYPE_CASTS(thisType, predicate) \
     DEFINE_TYPE_CASTS(thisType, AXObject, object, object->predicate, object.predicate)
 
 } // namespace blink
 
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::IgnoredReason);
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::NameSource);
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::DescriptionSource);
 
 #endif // AXObject_h