Forward BrowserAccessibility get_accRole to AXPlatformNode.

ui/accessibility/platform/ax_platform_node_win.h

 // Copyright 2015 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.
 
 #ifndef UI_ACCESSIBILITY_PLATFORM_AX_PLATFORM_NODE_WIN_H_
 #define UI_ACCESSIBILITY_PLATFORM_AX_PLATFORM_NODE_WIN_H_
 
 #include <atlbase.h>
 #include <atlcom.h>
 #include <oleacc.h>
@@ skipping 256 matching lines @@
                             void** object) override;
 
  protected:
   AXPlatformNodeWin();
 
   // AXPlatformNodeBase overrides.
   void Dispose() override;
 
  private:
   int MSAARole();
+  std::string StringOverrideForMSAARole();
+
   int MSAAState();
   int MSAAEvent(ui::AXEvent event);
 
   HRESULT GetStringAttributeAsBstr(
       ui::AXStringAttribute attribute,
       BSTR* value_bstr) const;
 
   void AddAlertTarget();
   void RemoveAlertTarget();
 
@@ skipping 19 matching lines @@
   // should be performed on a particular child ID, rather than this object.
   // This method tries to figure out the target object from |var_id| and
   // returns a pointer to the target object if it exists, otherwise nullptr.
   // Does not return a new reference.
   AXPlatformNodeWin* GetTargetFromChildID(const VARIANT& var_id);
 };
 
 }  // namespace ui
 
 #endif  // UI_ACCESSIBILITY_PLATFORM_AX_PLATFORM_NODE_WIN_H_