Hide AXPlatformNode on ChromeOS.

ui/accessibility/platform/ax_platform_node.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 UI_ACCESSIBILITY_PLATFORM_AX_PLATFORM_NODE_H_
 #define UI_ACCESSIBILITY_PLATFORM_AX_PLATFORM_NODE_H_
 
 #include "build/build_config.h"
 #include "ui/accessibility/ax_enums.h"
 #include "ui/accessibility/ax_export.h"
 #include "ui/gfx/native_widget_types.h"
 
-// Set PLATFORM_HAS_AX_PLATFORM_NODE_IMPL if this platform has a specific
-// implementation of AXPlatformNode::Create().
-#undef PLATFORM_HAS_AX_PLATFORM_NODE_IMPL
-
-#if defined(OS_WIN)
-#define PLATFORM_HAS_AX_PLATFORM_NODE_IMPL 1
-#endif
-
-#if defined(OS_MACOSX)
-#define PLATFORM_HAS_AX_PLATFORM_NODE_IMPL 1
-#endif
-
-#if defined(OS_LINUX) && !defined(OS_CHROMEOS) && defined(USE_X11)
-#define PLATFORM_HAS_AX_PLATFORM_NODE_IMPL 1
-#endif
-
 namespace ui {
 
 class AXPlatformNodeDelegate;
 
 // AXPlatformNode is the abstract base class for an implementation of
 // native accessibility APIs on supported platforms (e.g. Windows, Mac OS X).
 // An object that wants to be accessible can derive from AXPlatformNodeDelegate
 // and then call AXPlatformNode::Create. The delegate implementation should
 // own the AXPlatformNode instance (or otherwise manage its lifecycle).
 class AX_EXPORT AXPlatformNode {
  public:
   // Create an appropriate platform-specific instance. The delegate owns the
   // AXPlatformNode instance (or manages its lifecycle in some other way).
   static AXPlatformNode* Create(AXPlatformNodeDelegate* delegate);
 
   // Cast a gfx::NativeViewAccessible to an AXPlatformNode if it is one,
   // or return NULL if it's not an instance of this class.
   static AXPlatformNode* FromNativeViewAccessible(
       gfx::NativeViewAccessible accessible);
 
-  // Each platform accessibility object has a unique id that's guaranteed
-  // to be a positive number. (It's stored in an int32_t as opposed to
-  // uint32_t because some platforms want to negate it, so we want to ensure
-  // the range is below the signed int max.) This can be used when the
-  // id has to be unique across multiple frames, since node ids are
-  // only unique within one tree.
-  static int32_t GetNextUniqueId();
-
   // Call Destroy rather than deleting this, because the subclass may
   // use reference counting.
   virtual void Destroy();
 
   // Get the platform-specific accessible object type for this instance.
   // On some platforms this is just a type cast, on others it may be a
   // wrapper object or handle.
   virtual gfx::NativeViewAccessible GetNativeViewAccessible() = 0;
 
   // Fire a platform-specific notification that an event has occurred on
   // this object.
   virtual void NotifyAccessibilityEvent(ui::AXEvent event_type) = 0;
 
   // Return this object's delegate.
   virtual AXPlatformNodeDelegate* GetDelegate() const = 0;
 
  protected:
   AXPlatformNode();
   virtual ~AXPlatformNode();
 
   AXPlatformNode* GetFromUniqueId(int32_t unique_id);
 
   int32_t unique_id_;
 };
 
 }  // namespace ui
 
 #endif  // UI_ACCESSIBILITY_PLATFORM_AX_PLATFORM_NODE_H_