Remove unused typedef
Remove unused typedef

This removes unused typedef left in change:
https://chromium-review.googlesource.com/c/447697/
and fixes error:
dump_symbols.cc:613:35: error: unused typedef 'Word' [-Werror,-Wunused-local-typedef]

Change-Id: Ib5a82cd8af9a58ebf173b0f338fa9ad341819ef3
Reviewed-on: https://chromium-review.googlesource.com/459518
Reviewed-by: Mark Mentovai <f1b5a91d4d6ad523f2610114591c007e75d15084@chromium.org>

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