[base] Template hashmap on key and value

src/zone.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ZONE_H_
 #define V8_ZONE_H_
 
 #include <limits>
 
 #include "src/base/accounting-allocator.h"
@@ skipping 226 matching lines @@
     // freed by the Zone.
     SplayTree<Config, ZoneAllocationPolicy>::ResetRoot();
   }
 
   void* operator new(size_t size, Zone* zone) { return zone->New(size); }
 
   void operator delete(void* pointer) { UNREACHABLE(); }
   void operator delete(void* pointer, Zone* zone) { UNREACHABLE(); }
 };
 
-typedef base::TemplateHashMapImpl<ZoneAllocationPolicy> ZoneHashMap;
+typedef base::TemplateHashMapImpl<void*, void*, ZoneAllocationPolicy>
+    ZoneHashMap;
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ZONE_H_