Support accessible inline text boxes.

content/browser/accessibility/browser_accessibility_gtk.cc

Index: content/browser/accessibility/browser_accessibility_gtk.cc
diff --git a/content/browser/accessibility/browser_accessibility_gtk.cc b/content/browser/accessibility/browser_accessibility_gtk.cc
index faf4c82e307830f3f42715050b7f2a43271b6887..f1266c4b8ef22974a997accc06332135c50f00e0 100644
--- a/content/browser/accessibility/browser_accessibility_gtk.cc
+++ b/content/browser/accessibility/browser_accessibility_gtk.cc
@@ -208,6 +208,10 @@ static gint browser_accessibility_get_n_children(AtkObject* atk_object) {
   BrowserAccessibilityGtk* obj = ToBrowserAccessibilityGtk(atk_object);
   if (!obj)
     return 0;
+
+  if (obj->IsLeaf())
+    return 0;
+
   return obj->children().size();
 }
 
@@ -216,6 +220,13 @@ static AtkObject* browser_accessibility_ref_child(
   BrowserAccessibilityGtk* obj = ToBrowserAccessibilityGtk(atk_object);
   if (!obj)
     return NULL;
+
+  if (obj->IsLeaf())
+    return NULL;
+
+  if (index < 0 || index >= static_cast<gint>(obj->children().size()))
+    return NULL;
+
   AtkObject* result =
       obj->children()[index]->ToBrowserAccessibilityGtk()->GetAtkObject();
   g_object_ref(result);