Move PluginLoaderClient to PluginLoaderPosix in its own file.

content/content_browser.gypi

 # Copyright (c) 2011 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.
 
 {
   'dependencies': [
     '../crypto/crypto.gyp:crypto',
     '../net/net.gyp:net',
     '../net/net.gyp:http_server',
     '../ppapi/ppapi_internal.gyp:ppapi_proxy',
@@ skipping 259 matching lines @@
     # TODO:  These should be moved to test_support (see below), but
     # are currently used by production code in automation_provider.cc.
     'browser/net/url_request_failed_dns_job.cc',
     'browser/net/url_request_failed_dns_job.h',
     'browser/net/url_request_mock_http_job.cc',
     'browser/net/url_request_mock_http_job.h',
     'browser/net/url_request_slow_download_job.cc',
     'browser/net/url_request_slow_download_job.h',
     'browser/net/url_request_slow_http_job.cc',
     'browser/net/url_request_slow_http_job.h',
+    'browser/plugin_loader_posix.cc',
+    'browser/plugin_loader_posix.h',
+    'browser/plugin_process_host.cc',
+    'browser/plugin_process_host.h',
+    'browser/plugin_process_host_mac.cc',
+    'browser/plugin_service.cc',
+    'browser/plugin_service.h',
+    'browser/plugin_service_filter.h',
     'browser/power_save_blocker.h',
     'browser/power_save_blocker_common.cc',
     'browser/power_save_blocker_mac.cc',
     'browser/power_save_blocker_stub.cc',
     'browser/power_save_blocker_win.cc',
     'browser/ppapi_plugin_process_host.cc',
     'browser/ppapi_plugin_process_host.h',
-    'browser/plugin_process_host.cc',
-    'browser/plugin_process_host.h',
-    'browser/plugin_process_host_mac.cc',
-    'browser/plugin_service.cc',
-    'browser/plugin_service.h',
-    'browser/plugin_service_filter.h',
     'browser/quota_permission_context.h',
     'browser/renderer_host/accelerated_plugin_view_mac.h',
     'browser/renderer_host/accelerated_plugin_view_mac.mm',
     'browser/renderer_host/accelerated_surface_container_mac.cc',
     'browser/renderer_host/accelerated_surface_container_mac.h',
     'browser/renderer_host/accelerated_surface_container_manager_mac.cc',
     'browser/renderer_host/accelerated_surface_container_manager_mac.h',
     'browser/renderer_host/async_resource_handler.cc',
     'browser/renderer_host/async_resource_handler.h',
     'browser/renderer_host/backing_store.cc',
@@ skipping 367 matching lines @@
         ['exclude', '^browser/renderer_host/render_message_filter_win.cc'],
       ],
     }, {
       'sources/': [
         ['exclude', '^browser/renderer_host/render_widget_host_view_aura.cc'],
         ['exclude', '^browser/renderer_host/render_widget_host_view_aura.h'],
       ],
     }],
   ],
 }