Revert of Implement NativeViewAccessibilityWin using AXPlatformNodeWin.

ui/views/controls/webview/webview.cc

Index: ui/views/controls/webview/webview.cc
diff --git a/ui/views/controls/webview/webview.cc b/ui/views/controls/webview/webview.cc
index be33f1d58df31645fbb7b6bf00338af70442b028..e872a58b22e19250c01d06c28d00d2f1a0ed1c7c 100644
--- a/ui/views/controls/webview/webview.cc
+++ b/ui/views/controls/webview/webview.cc
@@ -16,6 +16,7 @@
 #include "ui/accessibility/ax_view_state.h"
 #include "ui/base/ui_base_switches_util.h"
 #include "ui/events/event.h"
+#include "ui/views/accessibility/native_view_accessibility.h"
 #include "ui/views/controls/native/native_view_host.h"
 #include "ui/views/focus/focus_manager.h"
 #include "ui/views/views_delegate.h"
@@ -36,10 +37,12 @@
       browser_context_(browser_context),
       allow_accelerators_(false) {
   AddChildView(holder_);  // Takes ownership of |holder_|.
+  NativeViewAccessibility::RegisterWebView(this);
 }
 
 WebView::~WebView() {
   SetWebContents(NULL);  // Make sure all necessary tear-down takes place.
+  NativeViewAccessibility::UnregisterWebView(this);
 }
 
 content::WebContents* WebView::GetWebContents() {