Refactoring: HashMap: provide a pointer match function, so users don't need to.

src/debug.h

Index: src/debug.h
diff --git a/src/debug.h b/src/debug.h
index 8a793a74facacb6e8ff142ea169e1ba63915d78a..3761fde55b86348f06968f37f8bf8e7ea25d97ed 100644
--- a/src/debug.h
+++ b/src/debug.h
@@ -175,7 +175,9 @@ class BreakLocationIterator {
 class ScriptCache : private HashMap {
  public:
   explicit ScriptCache(Isolate* isolate)
-    : HashMap(ScriptMatch), isolate_(isolate), collected_scripts_(10) {}
+      : HashMap(HashMap::PointersMatch),
+        isolate_(isolate),
+        collected_scripts_(10) {}
   virtual ~ScriptCache() { Clear(); }
 
   // Add script to the cache.
@@ -193,9 +195,6 @@ class ScriptCache : private HashMap {
     return ComputeIntegerHash(key, v8::internal::kZeroHashSeed);
   }
 
-  // Scripts match if their keys (script id) match.
-  static bool ScriptMatch(void* key1, void* key2) { return key1 == key2; }
-
   // Clear the cache releasing all the weak handles.
   void Clear();