[android_webview] Android.mk file cleanup.

android_webview/build/resources_config.mk

 # 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.
 
 # This file defines resources-related build variables which are shared by the
 # android_webview/Android.mk file and the frameworks/webview/chromium/Android.mk
 # file.
 
 android_webview_manifest_file := $(call my-dir)/AndroidManifest.xml
 
 # Resources.
-# The res_hack folder is necessary to defeat a build system "optimization" which
-# ends up skipping running aapt if there are no resource files in any of the
-# resources dirs. Unfortunately, because all of our resources are generated at
-# build time and because this check is performed when processing the Makefile
-# it tests positive when building from clean resulting in a build failure.
-# We defeat the optimization by including an empty values.xml file in the list.
 android_webview_resources_dirs := \
-    $(call my-dir)/res_hack \
     $(call my-dir)/../java/res \
     $(call intermediates-dir-for,GYP,shared)/android_webview_jarjar_content_resources/jarjar_res \
     $(call intermediates-dir-for,GYP,shared)/android_webview_jarjar_ui_resources/jarjar_res \
     $(call intermediates-dir-for,GYP,ui_strings_grd)/ui_strings_grd/res_grit \
     $(call intermediates-dir-for,GYP,content_strings_grd)/content_strings_grd/res_grit \
     $(call intermediates-dir-for,GYP,android_webview_strings_grd)/android_webview_strings_grd/res_grit
 
 android_webview_asset_dirs := \
     $(call intermediates-dir-for,APPS,webviewchromium-paks)
 
@@ skipping 66 matching lines @@
 # This list will be used to force the .pak files to be copied into the
 # intermediates folder before invoking appt from the Android 'glue layer'
 # makefile.
 android_webview_intermediates_pak_additional_deps := \
   $(foreach name,$(android_webview_final_pak_names), \
     $(call intermediates-dir-for,APPS,webviewchromium-paks)/$(name))
 
 # This is the stamp file for the android_webview_resources target.
 android_webview_resources_stamp := \
   $(call intermediates-dir-for,GYP,android_webview_resources)/android_webview_resources.stamp