message: Move the include guards for the key manager to the proper position.
  GitOrigin-RevId:
diff: //
  ///////////////////////////////////////////////////////////////////////////////
  -#include <algorithm>
  -#include <vector>
  -
  #ifndef TINK_KEY_MANAGER_H_
  #define TINK_KEY_MANAGER_H_
  +#include <algorithm>
  +#include <vector>
  +
  #include "absl/strings/string_view.h"
  #include "tink/util/errors.h"
  #include "tink/util/protobuf_helper.h"
  