Make some updates to extension iconography.

chrome/browser/ui/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/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 932 matching lines @@
       "webui/md_feedback/md_feedback_webui_message_handler.cc",
       "webui/md_feedback/md_feedback_webui_message_handler.h",
       "webui/md_history_ui.cc",
       "webui/md_history_ui.h",
       "webui/ntp/app_launcher_handler.cc",
       "webui/ntp/app_launcher_handler.h",
       "webui/ntp/app_resource_cache_factory.cc",
       "webui/ntp/app_resource_cache_factory.h",
       "webui/ntp/core_app_launcher_handler.cc",
       "webui/ntp/core_app_launcher_handler.h",
-      "webui/ntp/favicon_webui_handler.cc",
-      "webui/ntp/favicon_webui_handler.h",
       "webui/ntp/new_tab_ui.cc",
       "webui/ntp/new_tab_ui.h",
       "webui/ntp/ntp_resource_cache.cc",
       "webui/ntp/ntp_resource_cache.h",
       "webui/ntp/ntp_resource_cache_factory.cc",
       "webui/ntp/ntp_resource_cache_factory.h",
       "webui/options/autofill_options_handler.cc",
       "webui/options/autofill_options_handler.h",
       "webui/options/automatic_settings_reset_handler.cc",
       "webui/options/automatic_settings_reset_handler.h",
@@ skipping 2523 matching lines @@
       "test/test_confirm_bubble_model.cc",
       "test/test_confirm_bubble_model.h",
     ]
     deps += [ "//chrome/test:test_support_ui" ]
   }
 
   if (enable_extensions) {
     deps += [ "//extensions/browser" ]
   }
 }