remove the useless head files

HarfBuzz is not used in Font.cpp, can remove it

BUG=none
[email protected]

Review-Url: https://codereview.chromium.org/2403633003
Cr-Commit-Position: refs/heads/master@{#424097}
diff --git a/AUTHORS b/AUTHORS
index 9b5f731..133634b 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -760,6 +760,7 @@
 Kyle Plumadore <[email protected]>
 Sunchang Li <[email protected]>
 Yeol Park <[email protected]>
+Debug Wang <[email protected]>
 
 BlackBerry Limited <*@blackberry.com>
 Code Aurora Forum <*@codeaurora.org>