Remove som GYP annotations, remove unused manifest.

chromecast/android/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("//chromecast/chromecast.gni")
 
 # These targets shall only be referenced on Android builds.
 assert(is_android)
 
 # This source_set should only contain headers for internal code. These must be
 # built separately from public stub implementations of this code to keep the
 # dependency tree clean.
 source_set("platform_jni_loader") {
   sources = [
     "platform_jni_loader.h",
   ]
 }
 
-# GYP target: chromecast.gyp:libcast_shell_android
 shared_library("libcast_shell_android") {
   sources = [
     "//chromecast/app/android/cast_jni_loader.cc",
     "cast_jni_registrar.cc",
     "cast_jni_registrar.h",
     "cast_metrics_helper_android.cc",
     "cast_metrics_helper_android.h",
   ]
 
   deps = [
@@ skipping 12 matching lines @@
     "//content/public/browser",
     "//skia",
   ]
 
   if (chromecast_branding != "public") {
     deps += [ "//chromecast/internal:cast_shell_android_internal" ]
   } else {
     sources += [ "platform_jni_loader_stub.cc" ]
   }
 }