Revert of Make DOMWrapperWorld::current() return a reference instead of a pointer

Source/bindings/v8/custom/V8CustomSQLStatementErrorCallback.cpp

 /*
  * Copyright (c) 2009, 2012 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 29 matching lines @@
 namespace WebCore {
 
 bool V8SQLStatementErrorCallback::handleEvent(SQLTransaction* transaction, SQLError* error)
 {
     if (!canInvokeCallback())
         return true;
 
     v8::Isolate* isolate = v8::Isolate::GetCurrent();
     v8::HandleScope handleScope(isolate);
 
-    v8::Handle<v8::Context> v8Context = toV8Context(executionContext(), *m_world);
+    v8::Handle<v8::Context> v8Context = toV8Context(executionContext(), m_world.get());
     if (v8Context.IsEmpty())
         return true;
 
     v8::Context::Scope scope(v8Context);
 
     v8::Handle<v8::Value> transactionHandle = toV8(transaction, v8::Handle<v8::Object>(), v8Context->GetIsolate());
     v8::Handle<v8::Value> errorHandle = toV8(error, v8::Handle<v8::Object>(), isolate);
     if (transactionHandle.IsEmpty() || errorHandle.IsEmpty()) {
         if (!isScriptControllerTerminating())
             CRASH();
@@ skipping 13 matching lines @@
     // FIXME: This comment doesn't make much sense given what the code is actually doing.
     //
     // Step 6: If the error callback returns false, then move on to the next
     // statement, if any, or onto the next overall step otherwise. Otherwise,
     // the error callback did not return false, or there was no error callback.
     // Jump to the last step in the overall steps.
     return exceptionCatcher.HasCaught() || (!result.IsEmpty() && result->BooleanValue());
 }
 
 } // namespace WebCore