Make header include guards great again

runtime/vm/block_scheduler.h

 // Copyright (c) 2013, 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_BLOCK_SCHEDULER_H_
-#define VM_BLOCK_SCHEDULER_H_
+#ifndef RUNTIME_VM_BLOCK_SCHEDULER_H_
+#define RUNTIME_VM_BLOCK_SCHEDULER_H_
 
 #include "vm/allocation.h"
 
 namespace dart {
 
 class FlowGraph;
 
 class BlockScheduler : public ValueObject {
  public:
   explicit BlockScheduler(FlowGraph* flow_graph) : flow_graph_(flow_graph) { }
 
   FlowGraph* flow_graph() const { return flow_graph_; }
 
   void AssignEdgeWeights() const;
 
   void ReorderBlocks() const;
 
  private:
   FlowGraph* const flow_graph_;
 };
 
 }  // namespace dart
 
-#endif  // VM_BLOCK_SCHEDULER_H_
+#endif  // RUNTIME_VM_BLOCK_SCHEDULER_H_