Remove non-existing headers from the build

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")
 
 source_set("common_constants") {
   sources = [
@@ skipping 82 matching lines @@
       "extension_messages.cc",
       "extension_messages.h",
       "extension_paths.cc",
       "extension_paths.h",
       "extension_resource.cc",
       "extension_resource.h",
       "extension_set.cc",
       "extension_set.h",
       "extension_urls.cc",
       "extension_urls.h",
-      "extension_utility_messages.h",
       "extension_utility_types.h",
       "extensions_aliases.cc",
       "extensions_aliases.h",
       "extensions_client.cc",
       "extensions_client.h",
       "feature_switch.cc",
       "feature_switch.h",
-      "features/api_feature.h",
       "features/behavior_feature.cc",
       "features/behavior_feature.h",
       "features/complex_feature.cc",
       "features/complex_feature.h",
       "features/feature.cc",
       "features/feature.h",
       "features/feature_channel.cc",
       "features/feature_channel.h",
       "features/feature_provider.cc",
       "features/feature_provider.h",
@@ skipping 262 matching lines @@
       "//ui/base",
       "//ui/gfx",
       "//url",
     ]
 
     if (is_chromeos) {
       sources += [ "manifest_handlers/action_handlers_handler_unittest.cc" ]
     }
   }
 }  # enable_extensions