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Fix compile error with -Wshorten-64-to-32.

Bug: 881008
Change-Id: I52a1bab9cb7b4cb67ea4c275143390d42b192120
Reviewed-on: https://chromium-review.googlesource.com/1216524Reviewed-by: Will Harris <wfh@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590285}