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IntToString has been deprecated in favour of NumberToString.
Using NumberToString also fixes a few 64-bit truncation warnings.

Bug: 879657
Change-Id: Icd305fbc7ee005df63271a74412eb6dffad19712
Reviewed-on: https://chromium-review.googlesource.com/c/1448463
Auto-Submit: Raul Tambre <raul@tambre.ee>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#628413}