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

content/renderer/accessibility/blink_ax_tree_source.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/accessibility/blink_ax_tree_source.h"
 
 #include <set>
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
@@ skipping 347 matching lines @@
   if (src.actionVerb().length()) {
     dst->AddStringAttribute(ui::AX_ATTR_ACTION, src.actionVerb().utf8());
   }
   if (src.ariaAutoComplete().length())
     dst->AddStringAttribute(
         ui::AX_ATTR_AUTO_COMPLETE,
         src.ariaAutoComplete().utf8());
   if (src.isAriaReadOnly())
     dst->AddBoolAttribute(ui::AX_ATTR_ARIA_READONLY, true);
   if (src.isButtonStateMixed())
-    dst->AddBoolAttribute(ui::AX_ATTR_BUTTON_MIXED, true);
+    dst->AddBoolAttribute(ui::AX_ATTR_CHECKBOX_MIXED, true);
   if (src.canSetValueAttribute())
     dst->AddBoolAttribute(ui::AX_ATTR_CAN_SET_VALUE, true);
   if (src.hasComputedStyle()) {
     dst->AddStringAttribute(
         ui::AX_ATTR_DISPLAY, src.computedStyleDisplay().utf8());
   }
   if (src.keyboardShortcut().length()) {
     dst->AddStringAttribute(
         ui::AX_ATTR_SHORTCUT,
         src.keyboardShortcut().utf8());
@@ skipping 242 matching lines @@
   }
 }
 
 blink::WebDocument BlinkAXTreeSource::GetMainDocument() const {
   if (render_frame_ && render_frame_->GetWebFrame())
     return render_frame_->GetWebFrame()->document();
   return WebDocument();
 }
 
 }  // namespace content