Pass implementation object to supplemental classes by reference

Source/core/inspector/InspectorDOMAgent.cpp

Index: Source/core/inspector/InspectorDOMAgent.cpp
diff --git a/Source/core/inspector/InspectorDOMAgent.cpp b/Source/core/inspector/InspectorDOMAgent.cpp
index 4dd5f42c14f1aa0cd2f6e380cc8810afec1ac478..bb40e360239c25bce23fc4ba1862b81b12d997db 100644
--- a/Source/core/inspector/InspectorDOMAgent.cpp
+++ b/Source/core/inspector/InspectorDOMAgent.cpp
@@ -1007,8 +1007,9 @@ void InspectorDOMAgent::performSearch(ErrorString*, const String& whitespaceTrim
         // XPath evaluation
         for (Vector<Document*>::iterator it = docs.begin(); it != docs.end(); ++it) {
             Document* document = *it;
+            ASSERT(document);
             TrackExceptionState exceptionState;
-            RefPtr<XPathResult> result = DocumentXPathEvaluator::evaluate(document, whitespaceTrimmedQuery, document, 0, XPathResult::ORDERED_NODE_SNAPSHOT_TYPE, 0, exceptionState);
+            RefPtr<XPathResult> result = DocumentXPathEvaluator::evaluate(*document, whitespaceTrimmedQuery, document, 0, XPathResult::ORDERED_NODE_SNAPSHOT_TYPE, 0, exceptionState);
             if (exceptionState.hadException() || !result)
                 continue;