Roll HarfBuzz

https://chromium.googlesource.com/external/github.com/harfbuzz/harfbuzz.git/+log/8be74d8553453..1e06282105a2

This changes the upstream to github (where actual work is now done) and
picks up AAT work so we can drop the (buggy) CoreText backend on Mac.

Change-Id: Ib3fbbb8e07910d570e70489b4e78a9cb6fac3630
Reviewed-on: https://skia-review.googlesource.com/c/189876
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Hal Canary <halcanary@google.com>
diff --git a/DEPS b/DEPS
index 9a5f33f..cdcd603 100644
--- a/DEPS
+++ b/DEPS
@@ -12,7 +12,7 @@
   "third_party/externals/egl-registry"    : "https://skia.googlesource.com/external/github.com/KhronosGroup/EGL-Registry@a0bca08de07c7d7651047bedc0b653cfaaa4f2ae",
   "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/harfbuzz"        : "https://chromium.googlesource.com/external/github.com/harfbuzz/harfbuzz.git@1e06282105a2d579aab32094cc7abc10ed231978",
   "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",
   "third_party/externals/libjpeg-turbo"   : "https://skia.googlesource.com/external/github.com/libjpeg-turbo/libjpeg-turbo.git@2.0.0",