Extensions Cleanup: Simplify how code for IPC::ParamTraits<Manifest::Location> is generated.

extensions/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("//build/config/features.gni")
 import("//extensions/features/features.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 
 # TODO(crbug.com/731689): Assert that extensions are enabled.
 
@@ skipping 179 matching lines @@
       "manifest_handlers/requirements_info.cc",
       "manifest_handlers/requirements_info.h",
       "manifest_handlers/sandboxed_page_info.cc",
       "manifest_handlers/sandboxed_page_info.h",
       "manifest_handlers/shared_module_info.cc",
       "manifest_handlers/shared_module_info.h",
       "manifest_handlers/web_accessible_resources_info.cc",
       "manifest_handlers/web_accessible_resources_info.h",
       "manifest_handlers/webview_info.cc",
       "manifest_handlers/webview_info.h",
-      "manifest_location_param_traits.cc",
       "manifest_location_param_traits.h",
       "manifest_url_handlers.cc",
       "manifest_url_handlers.h",
       "message_bundle.cc",
       "message_bundle.h",
       "one_shot_event.cc",
       "one_shot_event.h",
       "permissions/api_permission.cc",
       "permissions/api_permission.h",
       "permissions/api_permission_set.cc",
@@ skipping 179 matching lines @@
       "//ui/base",
       "//ui/gfx",
       "//url",
     ]
 
     if (is_chromeos) {
       sources += [ "manifest_handlers/action_handlers_handler_unittest.cc" ]
     }
   }
 }  # enable_extensions