[mojo-edk] Minor clean-up in the ports layer

mojo/edk/system/ports/BUILD.gn

Index: mojo/edk/system/ports/BUILD.gn
diff --git a/mojo/edk/system/ports/BUILD.gn b/mojo/edk/system/ports/BUILD.gn
index 31cefaf4e0a97fbf0857a98e92649603ab5eba78..a262e02d1a61b48a8417295ce20a03b24f3ae777 100644
--- a/mojo/edk/system/ports/BUILD.gn
+++ b/mojo/edk/system/ports/BUILD.gn
@@ -6,6 +6,7 @@ import("//testing/test.gni")
 
 source_set("ports") {
   sources = [
+    "event.cc",
     "event.h",
     "hash_functions.h",
     "message.cc",
@@ -25,7 +26,6 @@ source_set("ports") {
 
   public_deps = [
     "//base",
-    "//mojo/public/c/system",
   ]
 }
 
@@ -37,8 +37,8 @@ test("mojo_system_ports_unittests") {
   deps = [
     ":ports",
     "//base",
+    "//base/test:run_all_unittests",
     "//base/test:test_support",
-    "//mojo/edk/test:run_all_unittests",
     "//testing/gtest",
   ]
 }