Revert "third_party/icu:  use upstream"

This reverts commit e6cfe7718592468518f15d4a95dfa194bd8ab57a.

Reason for revert: Android & Win7 perf/test failures.


Original change's description:
> third_party/icu:  use upstream
> 
>     Change DEPS to point at upstream, not chromium's fork.
>     `skia_use_icu` defaults to true everywhere but iOS
>     Clean up SkLoadICU:  use U_ICUDATA_ENTRY_POINT, no DLL.
>     Add data dep to icu/icu.gni
>     Scripts: icu/{make_data_assembly.py,make_data_obj_win.py}
>     Scripts: icu/{update_icu.sh,build_icu_data_file.py} for rebuilding
>     document process in icu/README.md
> 
> Bug: skia:8702
> Change-Id: I99789749ba84ae737f6c62475d0d676cd36715bb
> Reviewed-on: https://skia-review.googlesource.com/c/186870
> Commit-Queue: Hal Canary <halcanary@google.com>
> Reviewed-by: Florin Malita <fmalita@chromium.org>
> Reviewed-by: Ben Wagner <bungeman@google.com>

TBR=halcanary@google.com,bungeman@google.com,fmalita@chromium.org,fmalita@google.com

Change-Id: Id379bc2be7d53eca67b2c557ac20bd44073a6258
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:8702
Reviewed-on: https://skia-review.googlesource.com/c/189647
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
12 files changed