aw: Remove global AllowWait on UI thread

android_webview/BUILD.gn

 # Copyright 2015 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("//android_webview/system_webview_apk_tmpl.gni")
 import("//android_webview/webview_repack_locales.gni")
 import("//build/config/android/config.gni")
 import("//build/config/android/rules.gni")
 import("//build/config/locales.gni")
 import("//components/spellcheck/spellcheck_build_features.gni")
@@ skipping 465 matching lines @@
     "browser/parent_output_surface.cc",
     "browser/parent_output_surface.h",
     "browser/render_thread_manager.cc",
     "browser/render_thread_manager.h",
     "browser/renderer_host/auto_login_parser.cc",
     "browser/renderer_host/auto_login_parser.h",
     "browser/renderer_host/aw_render_view_host_ext.cc",
     "browser/renderer_host/aw_render_view_host_ext.h",
     "browser/renderer_host/aw_resource_dispatcher_host_delegate.cc",
     "browser/renderer_host/aw_resource_dispatcher_host_delegate.h",
-    "browser/scoped_allow_wait_for_legacy_web_view_api.h",
     "browser/scoped_app_gl_state_restore.cc",
     "browser/scoped_app_gl_state_restore.h",
     "browser/surfaces_instance.cc",
     "browser/surfaces_instance.h",
     "browser/tracing/aw_tracing_delegate.cc",
     "browser/tracing/aw_tracing_delegate.h",
     "common/android_webview_message_generator.cc",
     "common/android_webview_message_generator.h",
     "common/aw_content_client.cc",
     "common/aw_content_client.h",
@@ skipping 313 matching lines @@
   system_webview_apk_tmpl("system_webview_apk") {
     android_manifest = system_webview_android_manifest
     android_manifest_dep = ":system_webview_manifest"
     deps = [
       ":system_webview_resources",
       "//android_webview/glue",
     ]
     apk_name = "SystemWebView"
   }
 }