Use loops directly in apptest main files.

mojo/application/BUILD.gn

Index: mojo/application/BUILD.gn
diff --git a/mojo/application/BUILD.gn b/mojo/application/BUILD.gn
index 31d90c0297bd39d722e886690644a997eb7022d6..4b608835ca2f0328ea65d095cc5697590529f40c 100644
--- a/mojo/application/BUILD.gn
+++ b/mojo/application/BUILD.gn
@@ -35,13 +35,13 @@ source_set("content_handler") {
 
 source_set("test_support") {
   testonly = true
-  sources = [ "application_test_main_chromium.cc", ]
+  sources = [ "application_test_main_chromium.cc" ]
 
-  public_deps = [
-    "//mojo/public/cpp/application:test_support",
-  ]
+  public_deps = [ "//mojo/public/cpp/application:test_support" ]
   deps = [
     "//base",
     "//mojo/environment:chromium",
+    "//mojo/public/cpp/application",
+    "//mojo/public/cpp/system",
   ]
 }