[M60 Merge] No AX objects for comments and other irrelevant node types

third_party/WebKit/Source/modules/accessibility/AXObjectCacheImpl.cpp

Index: third_party/WebKit/Source/modules/accessibility/AXObjectCacheImpl.cpp
diff --git a/third_party/WebKit/Source/modules/accessibility/AXObjectCacheImpl.cpp b/third_party/WebKit/Source/modules/accessibility/AXObjectCacheImpl.cpp
index 15c14aa20fa614c2ca42dfdf146b3c810b8b3b67..9dfc29eabe1e1c5531120d893d96e03b257f99e2 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXObjectCacheImpl.cpp
+++ b/third_party/WebKit/Source/modules/accessibility/AXObjectCacheImpl.cpp
@@ -350,6 +350,9 @@ AXObjectImpl* AXObjectCacheImpl::GetOrCreate(Node* node) {
   if (!node)
     return 0;
 
+  if (!node->IsElementNode() && !node->IsTextNode() && !node->IsDocumentNode())
+    return 0;  // Only documents, elements and text nodes get a11y objects
+
   if (AXObjectImpl* obj = Get(node))
     return obj;