[packages] Remove JSON build package

There are no longer any tools that read these files.

Change-Id: Ifd303b901aa07f717ea585f1af81847424abc602
diff --git a/packages/tests/dart_unittests b/packages/tests/dart_unittests
deleted file mode 100644
index 4bf285f..0000000
--- a/packages/tests/dart_unittests
+++ /dev/null
@@ -1,21 +0,0 @@
-{
-    "host_tests" : [
-      "//topaz/bin/dart_fidl_json/test:dart_fidl_json_test",
-      "//topaz/examples/test/flutter_widget_test",
-      "//topaz/lib/keyboard/flutter:keyboard_test",
-      "//topaz/lib/setui/common:lib_setui_common_test",
-      "//topaz/lib/setui/flutter:lib_setui_flutter_test",
-      "//topaz/public/dart/composition_delegate:composition_delegate_tests",
-      "//topaz/public/dart/fuchsia_inspect:fuchsia_inspect_package_unittests",
-      "//topaz/public/dart/fuchsia_logger:fuchsia_logger_package_unittests",
-      "//topaz/public/dart/fuchsia_modular:fuchsia_modular_package_unittests",
-      "//topaz/public/dart/fuchsia_services:fuchsia_services_package_unittests",
-      "//topaz/public/dart/fuchsia_scenic_flutter:fuchsia_scenic_flutter_unittests",
-      "//topaz/public/dart/sledge:dart_sledge_tests",
-      "//topaz/public/dart/widgets:dart_widget_tests",
-      "//topaz/public/lib/app/dart:dart_app_tests",
-      "//topaz/public/lib/display/flutter:display_test",
-      "//topaz/public/lib/schemas/dart:dart_schema_tests",
-      "//topaz/shell/mondrian_story_shell:mondrian_story_shell_tests"
-    ]
-}