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Certain unit tests are having environment-specific failures due to mixed
usage of hermetic test data and non-hermetic prod configs. This refactor
is in preparation for fixing such non-hermetic-ness.

Besides, it's also in preparation for further reduction in usage of
deprecated input_methods.txt [1][2] (remnant from before the migration
to extension-based input methods circa 2011), towards its full removal.
Nowadays the canonical configs for 1P input methods on CrOS is
google_xkb_manifest.json [3].

[1] https://source.chromium.org/chromium/chromium/src/+/master:chromeos/ime/input_methods.txt;drc=5ab33d25bc676b63e4afbcfade6f9265a5f5a3ea
[2] https://source.chromium.org/chromium/chromium/src/+/master:chromeos/ime/gen_input_methods.py;drc=0303b222088853ce1c0af2bbc7f47937746eda97
[3] https://source.chromium.org/chromium/chromium/src/+/master:chrome/browser/resources/chromeos/input_method/google_xkb_manifest.json;drc=03ae97c2c311ac00d3e9a59203f4921c9e87e707

Bug: 970790, 1134526
Change-Id: I622bb36e8cd054d26431870cb2d0e70a3e1fe472
Cq-Include-Trybots: luci.chrome.try:linux-chromeos-chrome;luci.chromium.try:linux-chromeos-rel,linux-chromeos-dbg;luci.chromium.try:linux_chromium_chromeos_asan_rel_ng,linux_chromium_chromeos_msan_rel_ng
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2554276
Commit-Queue: Bao-Duy Tran <tranbaoduy@chromium.org>
Reviewed-by: John Palmer <jopalmer@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832332}