Move unique name generation and tracking into //content.

content/renderer/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/chromecast_build.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//content/common/features.gni")
 import("//media/media_options.gni")
@@ skipping 359 matching lines @@
     "stats_collection_controller.cc",
     "stats_collection_controller.h",
     "stats_collection_observer.cc",
     "stats_collection_observer.h",
     "text_input_client_observer.cc",
     "text_input_client_observer.h",
     "theme_helper_mac.h",
     "theme_helper_mac.mm",
     "top_level_blame_context.cc",
     "top_level_blame_context.h",
+    "unique_name_helper.cc",
+    "unique_name_helper.h",
     "web_frame_utils.cc",
     "web_frame_utils.h",
     "web_ui_extension.cc",
     "web_ui_extension.h",
     "web_ui_extension_data.cc",
     "web_ui_extension_data.h",
     "webclipboard_impl.cc",
     "webclipboard_impl.h",
     "webgraphicscontext3d_provider_impl.cc",
     "webgraphicscontext3d_provider_impl.h",
@@ skipping 559 matching lines @@
     # For the defines in mojo_media_config.
     public_configs = [ "//media/mojo/services:mojo_media_config" ]
   }
 
   if (!is_component_build) {
     public_deps = [
       ":renderer",
     ]
   }
 }