Replace most uses of asset_location with android_assets() template

third_party/WebKit/Source/platform/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/build/scripts/scripts.gni")
 import("//third_party/WebKit/Source/config.gni")
 import("//third_party/WebKit/Source/platform/platform.gni")
 import("//third_party/WebKit/Source/platform/platform_generated.gni")
@@ skipping 340 matching lines @@
     "//base/test:test_support",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/WebKit/Source/wtf",
     "//third_party/WebKit/Source/wtf:test_support",
     "//content/test:test_support",
   ]
   if (is_android) {
     apk_deps = [
       "//base:base_java",
-      "//content/shell/android:copy_content_shell_assets",
+      "//content/shell/android:content_shell_assets",
       "//net/android:net_java",
     ]
-    apk_asset_location = "$root_build_dir/content_shell/assets"
   }
 }
 
 test("platform_unittests") {
   visibility = []  # Allow re-assignment of list.
   visibility = [ "*" ]
   output_name = "blink_platform_unittests"
 
   sources = platform_test_files
 
@@ skipping 55 matching lines @@
 }
 
 if (current_cpu == "x86" || current_cpu == "x64") {
   source_set("blink_x86_sse") {
     sources = blink_platform_sse_files
     deps = [
       ":blink_common",
     ]
   }
 }