Reland of GN(Android): Stop specifying depfile under outputs

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("//build/config/android/config.gni")
 import("//build/config/android/rules.gni")
 import("//build/config/locales.gni")
 import("//tools/grit/repack.gni")
 import("system_webview_apk_tmpl.gni")
 import("webview_repack_locales.gni")
 
 declare_args() {
   # Package name of the system_webview_apk target.
   system_webview_package_name = "com.android.webview"
 }
 
 if (!defined(use_webview_internal_framework)) {
   use_webview_internal_framework = false
 }
 
+system_webview_android_manifest =
+    "$target_gen_dir/system_webview_apk/AndroidManifest.xml"
+
 group("android_webview") {
   if (!use_webview_internal_framework) {
     deps = [
       ":system_webview_apk",
     ]
   }
 }
 
 jinja_template("system_webview_manifest") {
   input = "apk/java/AndroidManifest.xml"
-  output = "$target_gen_dir/system_webview_manifest/AndroidManifest.xml"
+  output = system_webview_android_manifest
   variables = [ "package=$system_webview_package_name" ]
 }
 
 webview_repack_locales("repack_locales") {
   input_locales = locales
   output_locales = locales
 }
 
 locale_pak_resources("locale_paks") {
   sources = [
@@ skipping 735 matching lines @@
     "values-uk/android_webview_strings.xml",
     "values-vi/android_webview_strings.xml",
     "values-zh-rCN/android_webview_strings.xml",
     "values-zh-rTW/android_webview_strings.xml",
     "values/android_webview_strings.xml",
   ]
 }
 
 if (!use_webview_internal_framework) {
   system_webview_apk_tmpl("system_webview_apk") {
-    android_manifest = get_target_outputs(":system_webview_manifest")
-    android_manifest = android_manifest[1]
+    android_manifest = system_webview_android_manifest
     android_manifest_dep = ":system_webview_manifest"
     deps = [
       ":system_webview_resources",
       "//android_webview/glue",
     ]
     apk_name = "SystemWebView"
   }
 }