Oilpan: Rename weak callback related methods

Source/platform/heap/MarkingVisitor.h

Index: Source/platform/heap/MarkingVisitor.h
diff --git a/Source/platform/heap/MarkingVisitor.h b/Source/platform/heap/MarkingVisitor.h
index a95a4bb9f55075b98c32e68764b6df288fedd641..c93d51f0f5bcb447fc702244fc99a4193ca13eb4 100644
--- a/Source/platform/heap/MarkingVisitor.h
+++ b/Source/platform/heap/MarkingVisitor.h
@@ -41,7 +41,7 @@ public:
         Impl::registerDelayedMarkNoTracing(object);
     }
 
-    virtual void registerWeakMembers(const void* closure, const void* objectPointer, WeakPointerCallback callback) override
+    virtual void registerWeakMembers(const void* closure, const void* objectPointer, WeakCallback callback) override
     {
         Impl::registerWeakMembers(closure, objectPointer, callback);
     }
@@ -178,7 +178,7 @@ public:
 #endif
 
 protected:
-    virtual void registerWeakCellWithCallback(void** cell, WeakPointerCallback callback) override
+    virtual void registerWeakCellWithCallback(void** cell, WeakCallback callback) override
     {
         Impl::registerWeakCellWithCallback(cell, callback);
     }