Bazel: Remove unused gitiles__classpath_deps rule

Change-Id: I5840a9f45721bf36f76352c46ec37aa6af675a10

BUILD

diff --git a/BUILD b/BUILD
index 96f208c..e45eca3 100644
--- a/BUILD
+++ b/BUILD
@@ -30,13 +30,3 @@
         "zip -qr $$ROOT/$@ .",
     ]),
 )
-
-java_library(
-    name = "gitiles__classpath_deps",
-    testonly = 1,
-    visibility = ["//visibility:public"],
-    exports = [
-        ":gitiles__plugin",
-        "//lib/gitiles",
-    ],
-)