[Build] fix use_system_harfbuzz-ng

Use <> for harfbuzz includes to support the option to build with system
harfbuzz rather than the version in third_party.

Bug: 1016158
Change-Id: I8a85e928c010ca65e04b5ebc4909a051b4312672
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1873236
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Dominik Röttsches <drott@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708176}

components/paint_preview/common/subset_font.cc

@@ -7,11 +7,12 @@
 #include <memory>
 #include <utility>
 
+#include <hb-subset.h>
+#include <hb.h>
+
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/macros.h"
-#include "third_party/harfbuzz-ng/src/src/hb-subset.h"
-#include "third_party/harfbuzz-ng/src/src/hb.h"
 #include "third_party/skia/include/core/SkStream.h"
 #include "third_party/skia/include/core/SkTypeface.h"