Remove GetDataResourceAsASCIIString and remained uses

This CL replaces all remained uses of GetDataResourceAsASCIIString
as well as the implementation of GetDataResourceAsASCIIString
in data_resource_helper.

Bug: 983396
Change-Id: Ic388ac0c72162ae6c081797d23245b5b1f3d41e7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1746213
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686679}
7 files changed