Attempt to fix Windows compilation error.

runtime/vm/hash_table.h

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_HASH_TABLE_H_
 #define VM_HASH_TABLE_H_
 
 // Temporarily used when sorting the indices in EnumIndexHashTable.
 // TODO(koda): Remove these dependencies before using in production.
 #include <map>
@@ skipping 437 matching lines @@
       }
     }
     return result.raw();
   }
 };
 
 
 template<typename Base>
 class HashMap : public Base {
  public:
-  explicit HashMap(Array& data) : Base(data) {}
+  typedef Base BaseTable;
+  explicit HashMap(Array& data) : BaseTable(data) {}
   template<typename Key>
   RawObject* GetOrNull(const Key& key, bool* present = NULL) const {
     intptr_t entry = Base::FindKey(key);
     if (present != NULL) {
       *present = (entry != -1);
     }
     return (entry == -1) ? Object::null() : Base::GetPayload(entry, 0);
   }
   bool UpdateOrInsert(const Object& key, const Object& value) const {
     HashTables::EnsureLoadFactor(0.0, 0.75, *this);
@@ skipping 38 matching lines @@
 class EnumIndexHashMap : public HashMap<EnumIndexHashTable<KeyTraits, 1> > {
  public:
   typedef HashMap<EnumIndexHashTable<KeyTraits, 1> > Base;
   explicit EnumIndexHashMap(Array& data) : Base(data) {}
 };
 
 
 template<typename Base>
 class HashSet : public Base {
  public:
-  explicit HashSet(Array& data) : Base(data) {}
+  typedef Base BaseTable;
+  explicit HashSet(Array& data) : BaseTable(data) {}
   bool Insert(const Object& key) {
     HashTables::EnsureLoadFactor(0.0, 0.75, *this);
     intptr_t entry = -1;
     bool present = Base::FindKeyOrDeletedOrUnused(key, &entry);
     if (!present) {
       Base::InsertKey(entry, key);
     }
     return present;
   }
   template<typename Key>
@@ skipping 20 matching lines @@
 template<typename KeyTraits>
 class EnumIndexHashSet : public HashSet<EnumIndexHashTable<KeyTraits, 0> > {
  public:
   typedef HashSet<EnumIndexHashTable<KeyTraits, 0> > Base;
   explicit EnumIndexHashSet(Array& data) : Base(data) {}
 };
 
 }  // namespace dart
 
 #endif  // VM_HASH_TABLE_H_