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This change applies clang-tidy's modernize-loop-convert [1] in /base/i18n.

Reproduction steps:
- run clang-tidy's modernize-loop-convert
- run git cl format
- manually remove unused constants due to -Wunused-const-variable

[1] https://clang.llvm.org/extra/clang-tidy/checks/modernize-loop-convert.html

This CL was uploaded by git cl split.

R=jshin@chromium.org

Bug: 895746
Change-Id: I9b9790b60aaca3f6afb2b4bd1109d800aec5b26a
Reviewed-on: https://chromium-review.googlesource.com/c/1282404
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Jungshik Shin <jshin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#614377}