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CString is being removed. Also, this was sort of relying on
an implementation detail of CString, and this fixes that.

Bug: 950077
Change-Id: I4fab8de0ef8f3202c0144dcea8eeedf89e90ce77
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1648712Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Gyuyoung Kim <gyuyoung@igalia.com>
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#667238}