Make sure the root node of selector queries is a ContainerNode

Source/core/inspector/InspectorDOMAgent.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Google Inc. All rights reserved.
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 540 matching lines @@
         return;
     }
 
     pushChildNodesToFrontend(nodeId, sanitizedDepth);
 }
 
 void InspectorDOMAgent::querySelector(ErrorString* errorString, int nodeId, const String& selectors, int* elementId)
 {
     *elementId = 0;
     Node* node = assertNode(errorString, nodeId);
-    if (!node)
+    if (!node || !node->isContainerNode())
         return;
 
     TrackExceptionState exceptionState;
-    RefPtr<Element> element = node->querySelector(AtomicString(selectors), exceptionState);
+    RefPtr<Element> element = toContainerNode(node)->querySelector(AtomicString(selectors), exceptionState);
     if (exceptionState.hadException()) {
         *errorString = "DOM Error while querying";
         return;
     }
 
     if (element)
         *elementId = pushNodePathToFrontend(element.get());
 }
 
 void InspectorDOMAgent::querySelectorAll(ErrorString* errorString, int nodeId, const String& selectors, RefPtr<TypeBuilder::Array<int> >& result)
 {
     Node* node = assertNode(errorString, nodeId);
-    if (!node)
+    if (!node || !node->isContainerNode())
         return;
 
     TrackExceptionState exceptionState;
-    RefPtr<NodeList> nodes = node->querySelectorAll(AtomicString(selectors), exceptionState);
+    RefPtr<NodeList> nodes = toContainerNode(node)->querySelectorAll(AtomicString(selectors), exceptionState);
     if (exceptionState.hadException()) {
         *errorString = "DOM Error while querying";
         return;
     }
 
     result = TypeBuilder::Array<int>::create();
 
     for (unsigned i = 0; i < nodes->length(); ++i)
         result->addItem(pushNodePathToFrontend(nodes->item(i)));
 }
@@ skipping 1435 matching lines @@
     if (!m_documentNodeToIdMap.contains(m_document)) {
         RefPtr<TypeBuilder::DOM::Node> root;
         getDocument(errorString, root);
         return errorString->isEmpty();
     }
     return true;
 }
 
 } // namespace WebCore