Revert of Implement NativeViewAccessibilityWin using AXPlatformNodeWin.

ui/accessibility/platform/ax_platform_node.cc

Index: ui/accessibility/platform/ax_platform_node.cc
diff --git a/ui/accessibility/platform/ax_platform_node.cc b/ui/accessibility/platform/ax_platform_node.cc
index 363b3ee3b7f29fae05a47b199b1c089a23d77577..37b8ef41922ebd092c2980e676f20572b86cbc7f 100644
--- a/ui/accessibility/platform/ax_platform_node.cc
+++ b/ui/accessibility/platform/ax_platform_node.cc
@@ -9,21 +9,10 @@
 
 namespace ui {
 
-#if !defined(OS_MACOSX) && !defined(OS_WIN)
+#if !defined(OS_MACOSX)
 // static
 AXPlatformNode* AXPlatformNode::Create(AXPlatformNodeDelegate* delegate) {
-  return nullptr;
-}
-#endif
-
-#if !defined(OS_WIN)
-// This is the default implementation for platforms where native views
-// accessibility is unsupported or unfinished.
-//
-// static
-AXPlatformNode* AXPlatformNode::FromNativeViewAccessible(
-    gfx::NativeViewAccessible accessible) {
-  return nullptr;
+  return NULL;
 }
 #endif