Move RootIndexMap out of serializer file.

src/context-measure.h

 // Copyright 2015 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_CONTEXT_MEASURE_H_
 #define V8_CONTEXT_MEASURE_H_
 
-#include "src/snapshot/serialize.h"
+#include "src/address-map.h"
+#include "src/assert-scope.h"
+#include "src/objects.h"
 
 namespace v8 {
 namespace internal {
 
 class ContextMeasure : public ObjectVisitor {
  public:
   explicit ContextMeasure(Context* context);
 
   int Size() { return size_; }
   int Count() { return count_; }
@@ skipping 19 matching lines @@
   int size_;
 
   DisallowHeapAllocation no_gc_;
 
   DISALLOW_COPY_AND_ASSIGN(ContextMeasure);
 };
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CONTEXT_MEASURE_H_