Remove the ability of webpages to specify strings for the onbeforeunload dialog.

android_webview/native/webview_native.gyp

 # Copyright (c) 2012 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.
 {
   'variables': {
     'chromium_code': 1,
     'protoc_out_dir': '<(SHARED_INTERMEDIATE_DIR)/protoc_out',
   },
   'targets': [
     {
       # GN version: //android_webview/native:native
       'target_name': 'webview_native',
       'type': 'static_library',
       'dependencies': [
         '../../base/base.gyp:base_static',
         '../../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
         '../../cc/cc.gyp:cc',
         '../../components/components.gyp:autofill_content_browser',
         '../../components/components.gyp:devtools_http_handler',
         '../../components/components.gyp:web_contents_delegate_android',
+        '../../components/components_strings.gyp:components_strings',
         '../../content/content.gyp:content_common',
         '../../media/media.gyp:player_android',
         '../../net/net.gyp:net',
         '../../skia/skia.gyp:skia',
         '../../storage/storage_browser.gyp:storage',
         '../../storage/storage_common.gyp:storage_common',
         '../../ui/base/ui_base.gyp:ui_base',
         '../../ui/gfx/gfx.gyp:gfx',
         '../../ui/gfx/gfx.gyp:gfx_geometry',
         '../../third_party/boringssl/boringssl.gyp:boringssl',
@@ skipping 146 matching lines @@
     {
       'target_name': 'android_webview_aw_permission_request_resource',
       'type': 'none',
       'variables': {
         'source_file': 'permission/aw_permission_request.h',
       },
       'includes': [ '../../build/android/java_cpp_enum.gypi' ],
     },
   ],
 }