Revert of Move gn _run target generation into test().

third_party/cacheinvalidation/BUILD.gn

Index: third_party/cacheinvalidation/BUILD.gn
diff --git a/third_party/cacheinvalidation/BUILD.gn b/third_party/cacheinvalidation/BUILD.gn
index 16ec2c6c60167d7c044b0b69285154f66fb252d1..083c6ff0cf332359ceeea95f3190f6d74d55afa7 100644
--- a/third_party/cacheinvalidation/BUILD.gn
+++ b/third_party/cacheinvalidation/BUILD.gn
@@ -90,6 +90,15 @@
   ]
 }
 
+# TODO(GYP): Delete this after we've converted everything to GN.
+# The _run targets exist only for compatibility w/ GYP.
+group("cacheinvalidation_unittests_run") {
+  testonly = true
+  deps = [
+    ":cacheinvalidation_unittests",
+  ]
+}
+
 test("cacheinvalidation_unittests") {
   sources = [
     "src/google/cacheinvalidation/impl/invalidation-client-impl_test.cc",