Pass implementation object to supplemental classes by reference

Source/bindings/v8/custom/V8DocumentCustom.cpp

 /*
  * Copyright (C) 2007-2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 43 matching lines @@
 #include "core/xml/DocumentXPathEvaluator.h"
 #include "core/xml/XPathNSResolver.h"
 #include "core/xml/XPathResult.h"
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
 
 void V8Document::evaluateMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     RefPtr<Document> document = V8Document::toNative(info.Holder());
+    ASSERT(document);
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "evaluate", "Document", info.Holder(), info.GetIsolate());
     V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<>, expression, info[0]);
     RefPtr<Node> contextNode;
     if (V8Node::hasInstance(info[1], info.GetIsolate()))
         contextNode = V8Node::toNative(v8::Handle<v8::Object>::Cast(info[1]));
 
     const int resolverArgumentIndex = 2;
     RefPtr<XPathNSResolver> resolver = toXPathNSResolver(info[resolverArgumentIndex], info.GetIsolate());
     if (!resolver && !isUndefinedOrNull(info[resolverArgumentIndex])) {
         exceptionState.throwTypeError(ExceptionMessages::incorrectArgumentType(resolverArgumentIndex + 1, "is not a resolver function."));
         exceptionState.throwIfNeeded();
         return;
     }
 
     int type = toInt32(info[3]);
     RefPtr<XPathResult> inResult;
     if (V8XPathResult::hasInstance(info[4], info.GetIsolate()))
         inResult = V8XPathResult::toNative(v8::Handle<v8::Object>::Cast(info[4]));
 
-    V8TRYCATCH_VOID(RefPtr<XPathResult>, result, DocumentXPathEvaluator::evaluate(document.get(), expression, contextNode.get(), resolver.release(), type, inResult.get(), exceptionState));
+    V8TRYCATCH_VOID(RefPtr<XPathResult>, result, DocumentXPathEvaluator::evaluate(*document, expression, contextNode.get(), resolver.release(), type, inResult.get(), exceptionState));
     if (exceptionState.throwIfNeeded())
         return;
 
     v8SetReturnValueFast(info, result.release(), document.get());
 }
 
 } // namespace WebCore