content: Cleanup class/struct forward declarations

content/browser/accessibility/browser_accessibility_auralinux.h

 // Copyright (c) 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 CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_AURALINUX_H_
 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_AURALINUX_H_
 
 #include <atk/atk.h>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "content/browser/accessibility/browser_accessibility.h"
 #include "content/common/content_export.h"
 
 namespace content {
 
 class BrowserAccessibilityAuraLinux;
-class BrowserAccessibilityManagerAuraLinux;
 
 G_BEGIN_DECLS
 
 #define BROWSER_ACCESSIBILITY_TYPE (browser_accessibility_get_type())
 #define BROWSER_ACCESSIBILITY(obj)                               \
   (G_TYPE_CHECK_INSTANCE_CAST((obj), BROWSER_ACCESSIBILITY_TYPE, \
                               BrowserAccessibilityAtk))
 #define BROWSER_ACCESSIBILITY_CLASS(klass)                      \
   (G_TYPE_CHECK_CLASS_CAST((klass), BROWSER_ACCESSIBILITY_TYPE, \
                            BrowserAccessibilityAtkClass))
@@ skipping 62 matching lines @@
 
 CONTENT_EXPORT const BrowserAccessibilityAuraLinux*
 ToBrowserAccessibilityAuraLinux(const BrowserAccessibility* obj);
 
 CONTENT_EXPORT BrowserAccessibilityAuraLinux* ToBrowserAccessibilityAuraLinux(
     BrowserAccessibility* obj);
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_AURALINUX_H_