Fix race in BrowserAccessibilityManagerWin creation.

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 21de72612313f43c5556053536e66379ade07c14..051dbaf0953396fe1a4749629889acde67d91a86 100644
--- a/ui/views/controls/webview/webview.cc
+++ b/ui/views/controls/webview/webview.cc
@@ -298,23 +298,11 @@ void WebView::AttachWebContents() {
   FocusManager* const focus_manager = GetFocusManager();
   if (focus_manager && focus_manager->GetFocusedView() == this)
     OnFocus();
-
-#if defined(OS_WIN)
-  if (!is_embedding_fullscreen_widget_) {
-    web_contents()->SetParentNativeViewAccessible(
-        parent()->GetNativeViewAccessible());
-  }
-#endif
 }
 
 void WebView::DetachWebContents() {
-  if (web_contents()) {
+  if (web_contents())
     holder_->Detach();
-#if defined(OS_WIN)
-    if (!is_embedding_fullscreen_widget_)
-      web_contents()->SetParentNativeViewAccessible(NULL);
-#endif
-  }
 }
 
 void WebView::ReattachForFullscreenChange(bool enter_fullscreen) {