Cherry pick [android_webview] Remove custom package specifier from resources_config.

The pakge should be specified by the code in Android, not here.

BUG=396680
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=285111

Bug: 16723226
Change-Id: I618ae4b465491e44c77502e1c6dae258b2ee6c9a
diff --git a/android_webview/build/resources_config.mk b/android_webview/build/resources_config.mk
index 367310c..74c4597 100644
--- a/android_webview/build/resources_config.mk
+++ b/android_webview/build/resources_config.mk
@@ -26,7 +26,6 @@
     $(call intermediates-dir-for,APPS,webviewchromium-paks)
 
 android_webview_aapt_flags := --auto-add-overlay
-android_webview_aapt_flags += --custom-package com.android.webview.chromium
 android_webview_aapt_flags += --extra-packages org.chromium.ui
 android_webview_aapt_flags += --extra-packages org.chromium.content
 android_webview_aapt_flags += -0 pak