GN: Fix Android component build

components/dom_distiller/core/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.
 
 # GYP version: components/dom_distiller.gypi:dom_distiller_core
-static_library("core") {
+source_set("core") {
   sources = [
     "../android/component_jni_registrar.cc",
     "../android/component_jni_registrar.h",
     "article_distillation_update.cc",
     "article_distillation_update.h",
     "article_entry.cc",
     "article_entry.h",
     "distilled_content_store.cc",
     "distilled_content_store.h",
     "distiller.cc",
@@ skipping 39 matching lines @@
     "//components/resources",
     "//components/strings",
     "//net",
     "//skia",
     "//sync",
     "//ui/base",
     "//url",
   ]
 
   if (is_android) {
+    sources += [
+      "dom_distiller_service_android.cc",
+      "dom_distiller_service_android.h",
+    ]
     deps += [ ":jni_headers" ]
   }
 }
 
 # GYP version: components/dom_distiller.gypi:dom_distiller_test_support
 static_library("test_support") {
   testonly = true
   sources = [
     "dom_distiller_test_util.cc",
     "dom_distiller_test_util.h",
@@ skipping 41 matching lines @@
 
   generate_jni("jni_headers") {
     sources = [
       "../android/java/src/org/chromium/components/dom_distiller/core/DistilledPagePrefs.java",
       "../android/java/src/org/chromium/components/dom_distiller/core/DomDistillerService.java",
       "../android/java/src/org/chromium/components/dom_distiller/core/DomDistillerUrlUtils.java",
     ]
     jni_package = "dom_distiller_core"
   }
 }