Simplify //mojo/public/c/system targets

sky/engine/web/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("//build/config/ui.gni")
 import("//sky/engine/config.gni")
 
 visibility = [ "//sky/*" ]
 
 platform_web_unittest_files = [
@@ skipping 119 matching lines @@
       "//sky/engine:config",
     ]
   }
 }
 
 test("sky_unittests") {
   deps = [
     "//base",
     "//base/test:test_support",
     "//base:i18n",
+    "//sky/engine/testing/platform",
     "//sky/engine/wtf:test_support",
-    "//sky/engine/testing/platform",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/zlib",
     "//url",
     "//v8",
     ":test_support",
     ":web",
   ]
 
+  # TODO(abarth): This is a lie - this test is not embedded in an environment
+  # that injects the system thunks, so system calls don't actually work. This
+  # just tricks the linker into thinking that an implementation of these calls
+  # will be injected at runtime so the link succeeds.
+  deps += [ "//mojo/public/platform/native:system" ]
+
   sources = [
     "tests/RunAllTests.cpp",
   ]
 
   configs += [ "//sky/engine:config" ]
 
   if (!is_component_build) {
     deps += [ "//sky/engine/core" ]
 
     configs += [ "//sky/engine:inside_blink" ]
 
     sources += platform_web_unittest_files
   }
 }