Make header include guards great again

runtime/vm/weak_table.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_WEAK_TABLE_H_
-#define VM_WEAK_TABLE_H_
+#ifndef RUNTIME_VM_WEAK_TABLE_H_
+#define RUNTIME_VM_WEAK_TABLE_H_
 
 #include "vm/globals.h"
 
 #include "platform/assert.h"
 #include "vm/raw_object.h"
 
 namespace dart {
 
 class WeakTable {
  public:
@@ skipping 147 matching lines @@
   // number valid entries, and will determine the size_ after rehashing.
   intptr_t size_;
   intptr_t used_;
   intptr_t count_;
 
   DISALLOW_COPY_AND_ASSIGN(WeakTable);
 };
 
 }  // namespace dart
 
-#endif  // VM_WEAK_TABLE_H_
+#endif  // RUNTIME_VM_WEAK_TABLE_H_