Revert of Fix missing GN dependencies.

mojo/mojo_application_package.gni

Index: mojo/mojo_application_package.gni
diff --git a/mojo/mojo_application_package.gni b/mojo/mojo_application_package.gni
index f5ace4f7fa7a312e18f70f2ebbda2af63dd19277..233ee97c6d96ffd44b9dce01626efe20e2a9576f 100644
--- a/mojo/mojo_application_package.gni
+++ b/mojo/mojo_application_package.gni
@@ -20,18 +20,13 @@
       output_name = invoker.output_name
     }
 
-    copy_step_name = "${target_name}__copy_resources"
-    copy(copy_step_name) {
+    copy("copy_mojo_application_resources") {
       sources = invoker.resources
       outputs = [
         "$root_out_dir/$output_name/resources/{{source_file_part}}",
       ]
-      if (defined(invoker.testonly)) {
-        testonly = invoker.testonly
-      }
-      deps = mojo_deps
     }
-    mojo_deps += [ ":$copy_step_name" ]
+    mojo_deps += [ ":copy_mojo_application_resources" ]
   }
 
   mojo_native_application(target_name) {