Use gtest_prod_headers.

Bug: http://b/185916167
Test: treehugger
Change-Id: I3407052df4f12b01acc4a75c6bd0759f7a4b2c4c
diff --git a/updater/Android.bp b/updater/Android.bp
index 840e50a..35debaa 100644
--- a/updater/Android.bp
+++ b/updater/Android.bp
@@ -36,7 +36,6 @@
         "libfec_rs",
         "libavb",
         "libverity_tree",
-        "libgtest_prod",
         "liblog",
         "liblp",
         "libselinux",
@@ -51,6 +50,9 @@
         "libcutils",
         "libutils",
     ],
+    header_libs: [
+        "libgtest_prod_headers",
+    ],
 }
 
 cc_defaults {