[android_webview] Android.mk file cleanup.

android_webview/build/resources_config.mk

Index: android_webview/build/resources_config.mk
diff --git a/android_webview/build/resources_config.mk b/android_webview/build/resources_config.mk
index 107928b8a54fdc160a47a48a96e5dbc29d3540e8..cf4a3b06851141add304f8415a68e1db5529ef23 100644
--- a/android_webview/build/resources_config.mk
+++ b/android_webview/build/resources_config.mk
@@ -9,14 +9,7 @@
 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 \