Make //third_party/fontconfig explicitly depend on //third_party:freetype_harfbuzz.

Bug: 911836
Change-Id: Ia76687b3cb8d329792e5ef0310faee93d05344f2
Reviewed-on: https://chromium-review.googlesource.com/c/1361725Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Max Moroz <mmoroz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613792}

third_party/fontconfig/BUILD.gn

@@ -76,6 +76,9 @@ if (use_bundled_fontconfig) {
     configs += [ "//build/config/compiler:no_chromium_code" ]
 
     public_configs = [ ":fontconfig_config" ]
+    public_deps = [
+      "//third_party:freetype_harfbuzz",
+    ]
 
     if (is_clang) {
       cflags = [