Remove unused third party modules.

Bug: 133873742
Fixed: 133873742
Change-Id: I94a1c64c1c845d3d13cf618bb0d2342dfdef93ca
diff --git a/build/third_party/lighttpd b/build/third_party/lighttpd
deleted file mode 160000
index 9dfa55d..0000000
--- a/build/third_party/lighttpd
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 9dfa55d15937a688a92cbf2b7a8621b0927d06eb
diff --git a/build/third_party/xvfb b/build/third_party/xvfb
deleted file mode 160000
index aebb1aa..0000000
--- a/build/third_party/xvfb
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit aebb1aadf1422e4d81e831e13746b8f7ae322e07