Revert of Gets gn check to execute cleanly in mojo/common

mojo/common/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("//testing/test.gni")
 
 group("common") {
   deps = [
     ":common_base",
     ":url_type_converters",
   ]
 }
 
 # GYP version: mojo/mojo_base.gyp:mojo_common_lib
-source_set("common_base") {
+component("common_base") {
   output_name = "mojo_common_lib"
 
   sources = [
     "common_type_converters.cc",
     "common_type_converters.h",
     "data_pipe_file_utils.cc",
     "data_pipe_utils.cc",
     "data_pipe_utils.h",
     "handle_watcher.cc",
     "handle_watcher.h",
     "message_pump_mojo.cc",
     "message_pump_mojo.h",
     "message_pump_mojo_handler.h",
     "time_helper.cc",
     "time_helper.h",
     "user_agent.cc",
     "user_agent.h",
     "weak_binding_set.h",
     "weak_interface_ptr_set.h",
   ]
 
   defines = [ "MOJO_COMMON_IMPLEMENTATION" ]
 
   deps = [
     "//base",
     "//base/third_party/dynamic_annotations",
     "//third_party/mojo/src/mojo/public/c/system:for_component",
-    "//third_party/mojo/src/mojo/public/cpp/bindings:bindings",
-    "//third_party/mojo/src/mojo/public/cpp/system:system",
   ]
 }
 
 # GYP version: mojo/mojo_base.gyp:mojo_url_type_converters
 source_set("url_type_converters") {
   sources = [
     "url_type_converters.cc",
     "url_type_converters.h",
   ]
 
@@ skipping 41 matching lines @@
     ]
 
     deps = [
       "//base",
       "//mojo/application/public/cpp",
       "//mojo/services/tracing:bindings",
       "//third_party/mojo/src/mojo/public/cpp/bindings",
     ]
   }
 }