Add harfbuzz to the GN build.

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Review URL: https://codereview.chromium.org/284313010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271916 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/BUILD.gn b/BUILD.gn
index 73b50ae..ab33277 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -40,6 +40,7 @@
     #"//sdch",
     "//skia",
     "//third_party/brotli",
+    "//third_party/harfbuzz-ng",
     "//third_party/iccjpeg",
     "//third_party/icu",
     "//third_party/leveldatabase",