Fix compilation on Windows.

runtime/vm/object.h

 // Copyright (c) 2012, 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_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 2921 matching lines @@
   void WriteSentinel() const;
 
   HEAP_OBJECT_IMPLEMENTATION(ICData, Object);
   friend class Class;
 };
 
 
 class MegamorphicCache : public Object {
  public:
   static const int kInitialCapacity = 16;
-  static const double kLoadFactor = 0.75;
+  static const double kLoadFactor;
 
   RawArray* buckets() const;
   void set_buckets(const Array& buckets) const;
 
   intptr_t mask() const;
   void set_mask(intptr_t mask) const;
 
   intptr_t filled_entry_count() const;
   void set_filled_entry_count(intptr_t num) const;
 
@@ skipping 3188 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_