Views a11y: Implement AXPlatformNode::FromNativeViewAccessible on all platforms.

ui/views/view.h

 // Copyright (c) 2012 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_VIEWS_VIEW_H_
 #define UI_VIEWS_VIEW_H_
 
 #include <stddef.h>
 
 #include <algorithm>
@@ skipping 1241 matching lines @@
   // function makes the decision explicit.
   std::string DoPrintViewGraph(bool first, View* view_with_children);
 #endif
 
  private:
   friend class internal::PreEventDispatchHandler;
   friend class internal::PostEventDispatchHandler;
   friend class internal::RootView;
   friend class internal::ScopedChildrenLock;
   friend class FocusManager;
+#if !defined(PLATFORM_HAS_NATIVE_VIEW_ACCESSIBILITY_IMPL)
+  friend class NativeViewAccessibility;
+#endif
   friend class ViewLayerTest;
   friend class Widget;
 
   // Painting  -----------------------------------------------------------------
 
   enum SchedulePaintType {
     // Indicates the size is the same (only the origin changed).
     SCHEDULE_PAINT_SIZE_SAME,
 
     // Indicates the size changed (and possibly the origin).
@@ skipping 350 matching lines @@
   // Observers -------------------------------------------------------------
 
   base::ObserverList<ViewObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(View);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_VIEW_H_