Remove unused dependency

Change-Id: I4bd97a8b155d7901e07172088ebe0687b94d2289
diff --git a/tools/nongoogle.bzl b/tools/nongoogle.bzl
index e06fba3..62db566 100644
--- a/tools/nongoogle.bzl
+++ b/tools/nongoogle.bzl
@@ -1,5 +1,4 @@
 load("//tools/bzl:maven_jar.bzl", "maven_jar")
-load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_file")
 
 GUAVA_VERSION = "29.0-jre"