Bazel: Remote unused PLUGIN_DEPS variable

Change-Id: I39c1dfd9d5c1a025410bbd9cdf7eec0bd76dcccd

BUILD

diff --git a/BUILD b/BUILD
index bad06dc..b047e31 100644
--- a/BUILD
+++ b/BUILD
@@ -1,5 +1,5 @@
 load("//tools/bzl:junit.bzl", "junit_tests")
-load("//tools/bzl:plugin.bzl", "PLUGIN_DEPS", "PLUGIN_TEST_DEPS", "gerrit_plugin")
+load("//tools/bzl:plugin.bzl", "PLUGIN_TEST_DEPS", "gerrit_plugin")
 
 gerrit_plugin(
     name = "plugin-manager",