Relax another case where screen reader support was enabled.

content/browser/accessibility/browser_accessibility_manager_win.cc

Index: content/browser/accessibility/browser_accessibility_manager_win.cc
diff --git a/content/browser/accessibility/browser_accessibility_manager_win.cc b/content/browser/accessibility/browser_accessibility_manager_win.cc
index cdedf7a576c33dd564d811aa50fbab9da091ddcd..95295754f2b34cee2ccee869428957c5265f7dca 100644
--- a/content/browser/accessibility/browser_accessibility_manager_win.cc
+++ b/content/browser/accessibility/browser_accessibility_manager_win.cc
@@ -89,7 +89,12 @@ IAccessible* BrowserAccessibilityManagerWin::GetParentIAccessible() {
 }
 
 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() {