Use loadable module instead of shared library.

mojo/environment/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.
 
 # GYP version: mojo.gyp:mojo_environment_chromium
 static_library("chromium") {
   output_name = "mojo_environment_chromium"
 
   sources = [
+    "default_async_waiter_impl.cc",
+    "default_async_waiter_impl.h",
+    "default_logger_impl.cc",
+    "default_logger_impl.h",
     "environment.cc",
     # TODO(vtl): This is kind of ugly. (See TODO in logging.h.)
     "../public/cpp/environment/logging.h",
     "../public/cpp/environment/lib/logging.cc",
   ]
 
   deps = [
-    ":chromium_impl",
-    "//mojo/common",
-  ]
-
-  forward_dependent_configs_from = [
-    ":chromium_impl",
-  ]
-}
-
-# GYP version: mojo.gyp:mojo_environment_chromium_impl
-component("chromium_impl") {
-  output_name = "mojo_environment_impl"
-  visibility = "//mojo/*"
-
-  sources = [
-    "default_async_waiter_impl.cc",
-    "default_async_waiter_impl.h",
-    "default_logger_impl.cc",
-    "default_logger_impl.h",
-  ]
-
-  defines = [
-    "MOJO_ENVIRONMENT_IMPL_IMPLEMENTATION",
-  ]
-
-  deps = [
     "//base",
     "//base/third_party/dynamic_annotations",
     "//mojo/common",
   ]
 }