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

src/heap-snapshot-generator.h

Index: src/heap-snapshot-generator.h
diff --git a/src/heap-snapshot-generator.h b/src/heap-snapshot-generator.h
index 1582b2e1e85a94e9a518c2392a51370a59b41d37..b34658d95523bc11a9260acf69383b235f5b6b6b 100644
--- a/src/heap-snapshot-generator.h
+++ b/src/heap-snapshot-generator.h
@@ -315,9 +315,6 @@ class HeapEntriesMap {
         static_cast<uint32_t>(reinterpret_cast<uintptr_t>(thing)),
         v8::internal::kZeroHashSeed);
   }
-  static bool HeapThingsMatch(HeapThing key1, HeapThing key2) {
-    return key1 == key2;
-  }
 
   HashMap entries_;