Don't turn on accessibility automatically on Linux.

content/browser/renderer_host/render_widget_host_view_gtk.cc

Index: content/browser/renderer_host/render_widget_host_view_gtk.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_gtk.cc b/content/browser/renderer_host/render_widget_host_view_gtk.cc
index 43588272859094befc61962906218aba5b10ca94..9271fe63035dd90336df9baec10129f592f794e8 100644
--- a/content/browser/renderer_host/render_widget_host_view_gtk.cc
+++ b/content/browser/renderer_host/render_widget_host_view_gtk.cc
@@ -1499,9 +1499,6 @@ void RenderWidgetHostViewGtk::OnAccessibilityNotifications(
 }
 
 AtkObject* RenderWidgetHostViewGtk::GetAccessible() {
-  RenderWidgetHostImpl::From(GetRenderWidgetHost())->
-      SetAccessibilityMode(AccessibilityModeComplete);
-
   if (!browser_accessibility_manager_.get()) {
     GtkWidget* parent = gtk_widget_get_parent(view_.get());
     browser_accessibility_manager_.reset(