Remove security vulnerability

Bug: 193812251
Change-Id: I891cbf808791696566b01115e997cc29cba3e3e8
diff --git a/tools/repo_diff/service/repodiff/Dockerfile b/tools/repo_diff/service/repodiff/Dockerfile
index 61cc5d1..6222c4b 100644
--- a/tools/repo_diff/service/repodiff/Dockerfile
+++ b/tools/repo_diff/service/repodiff/Dockerfile
@@ -4,7 +4,6 @@
       curl \
       git \
       build-base \
-      && curl https://raw.githubusercontent.com/golang/dep/5bdae264c61be23446d622ea84a1c97b895f78cc/install.sh | sh \
       && curl https://storage.googleapis.com/git-repo-downloads/repo > /bin/repo \
       && chmod a+x /bin/repo \
       && cd /go/src/repodiff \