Relax another case where screen reader support was enabled.

content/browser/accessibility/browser_accessibility_manager_win.cc

 // 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.
 
 #include "content/browser/accessibility/browser_accessibility_manager_win.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <vector>
@@ skipping 71 matching lines @@
 }
 
 IAccessible* BrowserAccessibilityManagerWin::GetParentIAccessible() {
   BrowserAccessibilityDelegate* delegate = GetDelegateFromRootManager();
   if (!delegate)
     return NULL;
   return delegate->AccessibilityGetNativeViewAccessible();
 }
 
 void BrowserAccessibilityManagerWin::OnIAccessible2Used() {
-  BrowserAccessibilityStateImpl::GetInstance()->OnScreenReaderDetected();
+  // When IAccessible2 APIs have been used elsewhere in the codebase,
+  // enable basic web accessibility support. (Full screen reader support is
+  // detected later when specific more advanced APIs are accessed.)
+  BrowserAccessibilityStateImpl::GetInstance()->AddAccessibilityModeFlags(
+      ACCESSIBILITY_MODE_FLAG_NATIVE_APIS |
+      ACCESSIBILITY_MODE_FLAG_WEB_CONTENTS);
 }
 
 void BrowserAccessibilityManagerWin::UserIsReloading() {
   if (GetRoot()) {
     (new BrowserAccessibilityEventWin(
         BrowserAccessibilityEvent::FromRenderFrameHost,
         ui::AX_EVENT_NONE,
         IA2_EVENT_DOCUMENT_RELOAD,
         GetRoot()))->Fire();
   }
@@ skipping 225 matching lines @@
 
 void BrowserAccessibilityManagerWin::TrackScrollingObject(
     BrowserAccessibilityWin* node) {
   if (tracked_scroll_object_)
     tracked_scroll_object_->Release();
   tracked_scroll_object_ = node;
   tracked_scroll_object_->AddRef();
 }
 
 }  // namespace content