[oilpan] Remove GC_INFO_{DEFINE,DECLARE} macros

Source/heap/tests/HeapTest.cpp

Index: Source/heap/tests/HeapTest.cpp
diff --git a/Source/heap/tests/HeapTest.cpp b/Source/heap/tests/HeapTest.cpp
index 9f1e6777a4b8d784db16a6207c92d8dbdf980e97..d30b7a64ddfaf57580108021a354474535acf595 100644
--- a/Source/heap/tests/HeapTest.cpp
+++ b/Source/heap/tests/HeapTest.cpp
@@ -2494,7 +2494,7 @@ class CollectionsEmbeddedClass {
 
     template<typename T> friend struct FinalizerTrait;
 
-    class ObjectReferringToCollections : GarbageCollected<ObjectReferringToCollections> {
+    class ObjectReferringToCollections : public GarbageCollected<ObjectReferringToCollections> {
         DECLARE_GC_INFO
     public:
         void trace(Visitor* visitor)
@@ -2519,7 +2519,7 @@ class CollectionsEmbeddedClass {
         }
     };
 
-    class ObjectContainingCollections : GarbageCollected<ObjectContainingCollections> {
+    class ObjectContainingCollections : public GarbageCollected<ObjectContainingCollections> {
         DECLARE_GC_INFO
     public:
         IntSet m_set;