Fix AccessibilityModeTest.* on Win 8

content/browser/accessibility/accessibility_mode_helper.h

 // 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.
 
 #ifndef CONTENT_BROWSER_ACCESSIBILITY_ACCESSIBILITY_MODE_HELPER_H_
 #define CONTENT_BROWSER_ACCESSIBILITY_ACCESSIBILITY_MODE_HELPER_H_
 
 #include "content/common/accessibility_mode_enums.h"
 #include "content/common/content_export.h"
 
 namespace content {
 
+// Returns base accessibility mode constant, depends on OS version.
+CONTENT_EXPORT AccessibilityMode GetBaseAccessibilityMode();
+
 // Adds the given accessibility mode constant to the given accessibility mode
 // bitmap.
 CONTENT_EXPORT AccessibilityMode
     AddAccessibilityModeTo(AccessibilityMode to, AccessibilityMode mode_to_add);
 
 // Removes the given accessibility mode constant from the given accessibility
 // mode bitmap, managing the bits that are shared with other modes such that a
 // bit will only be turned off when all modes that depend on it have been
 // removed.
 CONTENT_EXPORT AccessibilityMode
     RemoveAccessibilityModeFrom(AccessibilityMode to,
                                 AccessibilityMode mode_to_remove);
 
 } //  namespace content
 
 #endif  // CONTENT_BROWSER_ACCESSIBILITY_ACCESSIBILITY_MODE_HELPER_H_