[oilpan] Remove GC_INFO_{DEFINE,DECLARE} macros

Source/heap/Heap.h

Index: Source/heap/Heap.h
diff --git a/Source/heap/Heap.h b/Source/heap/Heap.h
index 5f8740352c90e616c5ca78cb2a043dcc3e91f06f..769fd8842ed1b779c3a64e178102065772176a19 100644
--- a/Source/heap/Heap.h
+++ b/Source/heap/Heap.h
@@ -929,6 +929,9 @@ public:
 protected:
     GarbageCollected() { ASSERT(ThreadStateFor<ThreadingTrait<T>::Affinity>::State()->contains(reinterpret_cast<Address>(this))); }
     ~GarbageCollected() { }
+
+public:
+    typedef T GarbageCollectedBase;
 };
 
 // Forward declaration.
@@ -953,6 +956,7 @@ protected:
     {
         static_cast<T*>(this)->~T();
     }
+    template<typename Any> friend struct FinalizerTrait;
 
     GarbageCollectedFinalized() { }
     ~GarbageCollectedFinalized() { }