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

ui/views/accessibility/native_view_accessibility_win.h

Index: ui/views/accessibility/native_view_accessibility_win.h
diff --git a/ui/views/accessibility/native_view_accessibility_win.h b/ui/views/accessibility/native_view_accessibility_win.h
index dffd39ac58dc8a61d2ec2eb7926432b0223ab691..baecbf5019d3bf4b9cb86a4f0680db6827da4982 100644
--- a/ui/views/accessibility/native_view_accessibility_win.h
+++ b/ui/views/accessibility/native_view_accessibility_win.h
@@ -13,13 +13,14 @@ namespace views {
 
 class NativeViewAccessibilityWin : public NativeViewAccessibility {
  public:
-  NativeViewAccessibilityWin(View* view);
+  explicit NativeViewAccessibilityWin(View* view);
   ~NativeViewAccessibilityWin() override;
 
-  // NativeViewAccessibility.
+  // NativeViewAccessibility:
   gfx::NativeViewAccessible GetParent() override;
   gfx::AcceleratedWidget GetTargetForNativeAccessibilityEvent() override;
 
+ private:
   DISALLOW_COPY_AND_ASSIGN(NativeViewAccessibilityWin);
 };