Get rid of some C artifacts as noted in the initial review.

Change-Id: If476df8bbd0505157fce938777d3ee17d6da5c98
diff --git a/src/reference_table.h b/src/reference_table.h
index 140cc37..1181304 100644
--- a/src/reference_table.h
+++ b/src/reference_table.h
@@ -26,15 +26,13 @@
 
 class Object;
 
-#define kInvalidIndirectRefObject reinterpret_cast<Object*>(0xdead4321)
-#define kClearedJniWeakGlobal reinterpret_cast<Object*>(0xdead1234)
+static const Object* const kInvalidIndirectRefObject = reinterpret_cast<Object*>(0xdead4321);
+static const Object* const kClearedJniWeakGlobal = reinterpret_cast<Object*>(0xdead1234);
 
-/*
- * Maintain a table of references.  Used for internal local references,
- * JNI monitor references, and JNI pinned array references.
- *
- * None of the functions are synchronized.
- */
+// Maintain a table of references.  Used for internal local references,
+// JNI monitor references, and JNI pinned array references.
+//
+// None of the functions are synchronized.
 class ReferenceTable {
  public:
   ReferenceTable(const char* name, size_t initial_size, size_t max_size);