Update AX role mapping for summary to AXButton on Mac

content/app/strings/content_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!-- This file contains definitions of resources that will be translated for
 each locale. Specifically, these are UI strings that are used by content that
 need to be translated for each locale.-->
 
 <!-- Some of these strings and string descriptions were taken from
 WebKit/win/WebCoreLocalizedStrings.cpp so we include the original license
 below:
 
@@ skipping 276 matching lines @@
       </message>
       <message name="IDS_AX_ROLE_DEFINITION" desc="Accessibility role description for a definition">
         definition
       </message>
       <message name="IDS_AX_ROLE_DESCRIPTION_LIST" desc="Accessibility role description for a definition list">
         definition list
       </message>
       <message name="IDS_AX_ROLE_DESCRIPTION_TERM" desc="Accessibility role description for description term (as in a description list)">
         term
       </message>
+      <message name="IDS_AX_ROLE_DISCLOSURE_TRIANGLE" desc="Accessibility role description for a disclosure triangle, a control shaped like a triangle that expands or collapses to show or hide extra content">
+        disclosure triangle
+      </message>
       <message name="IDS_AX_ROLE_FEED" desc="Accessibility role description for a scrollable list of articles.">
         feed
       </message>
       <message name="IDS_AX_ROLE_FIGURE" desc="Accessibility role description for figure">
         figure
       </message>
       <message name="IDS_AX_ROLE_FORM" desc="Accessibility role description for form">
         form
       </message>
       <message name="IDS_AX_ROLE_FOOTER" desc="Accessibility role description for footers">
@@ skipping 88 matching lines @@
         </message>
         <message name="IDS_AX_ROLE_DATE_TIME" desc="Accessibility role description for a date / time picker">
           date and time picker
         </message>
         <message name="IDS_AX_ROLE_DIALOG" desc="Accessibility role description for a dialog">
           dialog
         </message>
         <message name="IDS_AX_ROLE_DIRECTORY" desc="Accessibility role description for a directory, for example a table of contents or list of employees">
           directory
         </message>
-        <message name="IDS_AX_ROLE_DISCLOSURE_TRIANGLE" desc="Accessibility role description for a disclosure triangle, a control shaped like a triangle that expands or collapses to show or hide extra content">
-          disclosure triangle
-        </message>
         <message name="IDS_AX_ROLE_DOCUMENT" desc="Accessibility role description for a document">
           document
         </message>
         <message name="IDS_AX_ROLE_EMBEDDED_OBJECT" desc="Accessibility role description for an embedded object, like a video inside a web page">
           object
         </message>
         <message name="IDS_AX_ROLE_GRAPHIC" desc="Accessibility role description for a graphic or image">
           graphic
         </message>
         <message name="IDS_AX_ROLE_HEADING_WITH_LEVEL" desc="Accessibility role description for a heading with a heading level, for example 'heading 1' is the most important heading and 'heading 3' is less important">
@@ skipping 468 matching lines @@
         Off
       </message>
 
       <message name="IDS_PLUGIN_INITIALIZATION_ERROR" desc="A message displayed when a plugin failed to load">
         Couldn't load plugin.
       </message>
 
     </messages>
   </release>
 </grit>