Make the fuchsia mojo/public repo the source of truth.

mojo/public/cpp/system/tests/BUILD.gn

Index: mojo/public/cpp/system/tests/BUILD.gn
diff --git a/mojo/public/cpp/system/tests/BUILD.gn b/mojo/public/cpp/system/tests/BUILD.gn
deleted file mode 100644
index f1aee055bbe132313dcb67bd47fdfff9cefe8259..0000000000000000000000000000000000000000
--- a/mojo/public/cpp/system/tests/BUILD.gn
+++ /dev/null
@@ -1,24 +0,0 @@
-# Copyright 2014 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-import("../../../mojo_sdk.gni")
-
-mojo_sdk_source_set("tests") {
-  testonly = true
-
-  sources = [
-    "buffer_unittest.cc",
-    "data_pipe_unittest.cc",
-    "handle_unittest.cc",
-    "macros_unittest.cc",
-    "message_pipe_unittest.cc",
-    "time_unittest.cc",
-    "wait_unittest.cc",
-  ]
-
-  mojo_sdk_deps = [
-    "mojo/public:gtest",
-    "mojo/public/cpp/system",
-  ]
-}