Replace most uses of asset_location with android_assets() template

third_party/WebKit/Source/web/BUILD.gn

 # 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.
 
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//third_party/WebKit/Source/bindings/bindings.gni")
 import("//third_party/WebKit/Source/config.gni")
 import("//third_party/WebKit/Source/core/core.gni")
 import("//third_party/WebKit/Source/modules/modules.gni")
@@ skipping 125 matching lines @@
     sources += bindings_unittest_files
     sources += core_unittest_files
     sources += modules_unittest_files
     sources += platform_unittest_support_files
     sources += platform_web_unittest_files
   }
 
   if (is_android) {
     apk_deps = [
       "//base:base_java",
+      "//content/shell/android:content_shell_assets",
       "//net/android:net_java",
-      "//content/shell/android:copy_content_shell_assets",
     ]
-    apk_asset_location = "$root_build_dir/content_shell/assets"
   }
 }