Make gn check //mojo/public/* pass

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

Index: mojo/public/cpp/environment/tests/BUILD.gn
diff --git a/mojo/public/cpp/environment/tests/BUILD.gn b/mojo/public/cpp/environment/tests/BUILD.gn
index 644723f63f98d70ab05f1ba284e10c1c587c1f32..55ded1038230ea27cd528234dff0d5e6068bff2f 100644
--- a/mojo/public/cpp/environment/tests/BUILD.gn
+++ b/mojo/public/cpp/environment/tests/BUILD.gn
@@ -4,17 +4,19 @@
 
 # GYP version: mojo/mojo_public_tests.gypi:mojo_public_environment_unittests
 test("mojo_public_environment_unittests") {
+  sources = [
+    "async_waiter_unittest.cc",
+    "logger_unittest.cc",
+    "logging_unittest.cc",
+  ]
+
   deps = [
     "//mojo/common/test:run_all_unittests",
+    "//mojo/public/c/environment",
     "//mojo/public/cpp/environment:standalone",
+    "//mojo/public/cpp/system",
     "//mojo/public/cpp/test_support:test_utils",
     "//mojo/public/cpp/utility",
     "//testing/gtest",
   ]
-
-  sources = [
-    "async_waiter_unittest.cc",
-    "logger_unittest.cc",
-    "logging_unittest.cc",
-  ]
 }