Switch SkyShell to its own ResourceExtractor

sky/apk/rules.gni

 # 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")
 
 package_root = "$root_gen_dir/dart-pkg/packages"
 
 template("sky_apk") {
   android_apk(target_name) {
     apk_name = invoker.apk_name
     android_manifest = invoker.android_manifest
 
     native_libs = [ "libsky_shell.so" ]
     asset_location = "$root_build_dir/sky_shell/assets"
 
     deps = [
              "//base:base_java",
              "//sky/shell:assets",
              "//sky/shell:java",
              "//sky/shell:sky_shell",
            ] + invoker.deps
   }
 }
 
 template("sky_app") {
-  # Note: org.chromium.base.ResourceExtractor knows about 'snapshot_blob.bin'.
+  # Note: org.domokit.sky.shell.SkyApplication knows about 'snapshot_blob.bin'.
   snapshot = "$target_gen_dir/snapshot_blob.bin"
 
   action("gen_snapshot") {
     main_dart = invoker.main_dart
 
     inputs = [
       main_dart,
     ]
     outputs = [
       snapshot,
@@ skipping 86 matching lines @@
       "//sky/shell:sky_shell",
       ":assets",
       ":gen_snapshot",
     ]
 
     if (defined(invoker.deps)) {
       deps += invoker.deps
     }
   }
 }