Remove ICU check from subset_harfbuzz
Remove ICU check from subset_harfbuzz

The Skia build of HarfBuzz does not use ICU, so there is no need to
initialize it. If a user uses a HarfBuzz build which does use ICU, they
will need enuse that ICU is initialized in their own way.

Change-Id: I89bd518dbf3c58aaaee2463a26d6402738dfbf97
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/453140
Reviewed-by: Julia Lavrova <66a91ddff0a66e6df510780220f7ed6687af5ca5@google.com>
Commit-Queue: Ben Wagner <53965154ffeecc4a10886eab9259e95965f2979a@google.com>

aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,aosp-mirror/platform_external_skia