Refactor UniqueNameHelper to use an adapter pattern for code sharing.

content/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("features.gni")
 import("//build/buildflag_header.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
@@ skipping 320 matching lines @@
     "service_worker/service_worker_utils.cc",
     "service_worker/service_worker_utils.h",
     "site_isolation_policy.cc",
     "site_isolation_policy.h",
     "speech_recognition_messages.h",
     "swapped_out_messages.cc",
     "swapped_out_messages.h",
     "text_input_client_messages.h",
     "text_input_state.cc",
     "text_input_state.h",
+    "unique_name_helper.cc",
+    "unique_name_helper.h",
     "url_request_struct_traits.cc",
     "url_request_struct_traits.h",
     "url_schemes.cc",
     "url_schemes.h",
     "user_agent.cc",
     "utility_messages.h",
     "view_message_enums.h",
     "view_messages.h",
     "worker_messages.h",
     "zygote_commands_linux.h",
@@ skipping 292 matching lines @@
     "//ui/gfx/mojo",
     "//url/mojo:url_mojom_gurl",
     "//url/mojo:url_mojom_origin",
   ]
 
   component_output_prefix = "content_common_mojo_bindings"
   export_class_attribute = "CONTENT_EXPORT"
   export_define = "CONTENT_IMPLEMENTATION=1"
   export_header = "content/common/content_export.h"
 }