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This reverts commit 43cd4f53.

This time, I removed DCHECK and also inlined
FilePath("/").AppendRelativePath() directly in the caller.

BUG=b:171847983
TEST=unittest

Change-Id: I4ff3ed1313a0eb38457b8b1d2c1ca1ddf450473f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2612789Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Commit-Queue: Satoshi Niwa <niwa@chromium.org>
Auto-Submit: Satoshi Niwa <niwa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840975}