Simplify //mojo/public/c/system targets

mojo/public/c/system/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("../../mojo_sdk.gni")
 
 # Depend on this target to use the types etc defined in the system without
 # linking against a specific implementation of the system. To link against a
 # particular implementation, use the :for_component or
 # :for_shared_library targets, depending on the type of target you are.
@@ skipping 20 matching lines @@
 # section.
 #
 # For shared_library targets (e.g., a Mojo App), add
 # //mojo/public/c/system:for_shared_library to your deps
 
 # TODO(jamesr): Eliminate the need for these targets. crbug.com/438701
 group("for_shared_library") {
   public_deps = [
     ":system",
   ]
-  if (is_component_build) {
-    deps = [
-      "../../../edk/system",
-    ]
-  } else {
-    deps = [
-      "../../platform/native:system_thunks",
-    ]
-  }
+  deps = [
+    "../../platform/native:system",
+  ]
 }
 
 group("for_component") {
   public_deps = [
     ":system",
   ]
   if (is_component_build) {
     deps = [
       "../../../edk/system",
     ]
   }
 }