Oilpan: have Console be on the heap by default.

Source/core/workers/WorkerConsole.h

 /*
  * Copyright (C) 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2013 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 29 matching lines @@
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class ConsoleMessage;
 class WorkerGlobalScope;
 
 class WorkerConsole final : public ConsoleBase {
     DEFINE_WRAPPERTYPEINFO();
 public:
-    static PassRefPtrWillBeRawPtr<WorkerConsole> create(WorkerGlobalScope* scope)
+    static WorkerConsole* create(WorkerGlobalScope* scope)
     {
-        return adoptRefWillBeNoop(new WorkerConsole(scope));
+        return new WorkerConsole(scope);
     }
     virtual ~WorkerConsole();
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
     virtual ExecutionContext* context() override;
     virtual void reportMessageToConsole(PassRefPtrWillBeRawPtr<ConsoleMessage>) override;
 
 private:
     explicit WorkerConsole(WorkerGlobalScope*);
 
     RawPtrWillBeMember<WorkerGlobalScope> m_scope;
 };
 
 } // namespace blink
 
 #endif // WorkerConsole_h