Move default_locale manifest handler out of //chrome

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("//mojo/public/tools/bindings/mojom.gni")
 
 # GYP version: extensions/extensions.gyp:extensions_common_constants
 source_set("common_constants") {
   sources = [
@@ skipping 104 matching lines @@
     "manifest_constants.cc",
     "manifest_constants.h",
     "manifest_handler.cc",
     "manifest_handler.h",
     "manifest_handler_helpers.cc",
     "manifest_handler_helpers.h",
     "manifest_handlers/background_info.cc",
     "manifest_handlers/background_info.h",
     "manifest_handlers/csp_info.cc",
     "manifest_handlers/csp_info.h",
+    "manifest_handlers/default_locale_handler.cc",
+    "manifest_handlers/default_locale_handler.h",
     "manifest_handlers/externally_connectable.cc",
     "manifest_handlers/externally_connectable.h",
     "manifest_handlers/file_handler_info.cc",
     "manifest_handlers/file_handler_info.h",
     "manifest_handlers/icons_handler.cc",
     "manifest_handlers/icons_handler.h",
     "manifest_handlers/incognito_info.cc",
     "manifest_handlers/incognito_info.h",
     "manifest_handlers/kiosk_mode_info.cc",
     "manifest_handlers/kiosk_mode_info.h",
@@ skipping 117 matching lines @@
   }
 
   if (is_win) {
     cflags = [
       "/wd4267", # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     ]
   }
 }
 
 } # enable_extensions