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>
diff --git a/DEPS b/DEPS
index b3060f7..841df8f 100644
--- a/DEPS
+++ b/DEPS
@@ -13,7 +13,7 @@
   "third_party/externals/expat"           : "https://android.googlesource.com/platform/external/expat.git@android-6.0.1_r55",
   "third_party/externals/freetype"        : "https://skia.googlesource.com/third_party/freetype2.git@7edc937fe679d14d66f55cf6f7fa607925d38f3c",
   "third_party/externals/harfbuzz"        : "https://skia.googlesource.com/third_party/harfbuzz.git@8be74d85534534dbdd39a0a6f496e26e9f3e661d",
-  "third_party/externals/icu"             : "https://skia.googlesource.com/external/github.com/unicode-org/icu@a96dc7faa584c2408c6fa1e9c61d121d45a33563",
+  "third_party/externals/icu"             : "https://chromium.googlesource.com/chromium/deps/icu.git@407b39301e71006b68bd38e770f35d32398a7b14",
   "third_party/externals/imgui"           : "https://skia.googlesource.com/external/github.com/ocornut/imgui.git@d38d7c6628bebd02692cfdd6fa76b4d992a35b75",
   # TODO: remove jsoncpp after migrating clients to SkJSON
   "third_party/externals/jsoncpp"         : "https://chromium.googlesource.com/external/github.com/open-source-parsers/jsoncpp.git@1.0.0",