Add an accessibility mode for editable text fields only.

content/browser/renderer_host/render_widget_host_view_win.cc

Index: content/browser/renderer_host/render_widget_host_view_win.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_win.cc b/content/browser/renderer_host/render_widget_host_view_win.cc
index aee7ccaf6aaf74f8ee0bed3031dc6e1210a9df0e..6f263a933657ded3ba818b3d1f6fe45df3af52e7 100644
--- a/content/browser/renderer_host/render_widget_host_view_win.cc
+++ b/content/browser/renderer_host/render_widget_host_view_win.cc
@@ -2280,7 +2280,8 @@ LRESULT RenderWidgetHostViewWin::OnGetObject(UINT message, WPARAM wparam,
     // An MSAA client requestes our custom id. Assume that we have detected an
     // active windows screen reader.
     BrowserAccessibilityState::GetInstance()->OnScreenReaderDetected();
-    render_widget_host_->EnableRendererAccessibility();
+    if (BrowserAccessibilityState::GetInstance()->IsAccessibleBrowser())
+      render_widget_host_->SetAccessibilityMode(AccessibilityModeComplete);
 
     // Return with failure.
     return static_cast<LRESULT>(0L);