[Offline Pages] Add a GCMAppHandler for offline page prefetch.

components/offline_pages/content/BUILD.gn

Index: components/offline_pages/content/BUILD.gn
diff --git a/components/offline_pages/content/BUILD.gn b/components/offline_pages/content/BUILD.gn
deleted file mode 100644
index 4be39a2699a70b82643448eca27f7e0d5e783791..0000000000000000000000000000000000000000
--- a/components/offline_pages/content/BUILD.gn
+++ /dev/null
@@ -1,44 +0,0 @@
-# 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.
-
-if (is_android) {
-  import("//build/config/android/rules.gni")
-}
-
-static_library("content") {
-  sources = [
-    "prefetch_service_factory.cc",
-    "prefetch_service_factory.h",
-    "suggested_articles_observer.cc",
-    "suggested_articles_observer.h",
-  ]
-
-  deps = [
-    "//base",
-    "//components/keyed_service/content",
-    "//components/ntp_snippets",
-    "//components/offline_pages/core",
-    "//components/offline_pages/core:switches",
-    "//components/offline_pages/core/prefetch",
-    "//content/public/browser",
-  ]
-}
-
-source_set("unit_tests") {
-  testonly = true
-  sources = [
-    "suggested_articles_observer_unittest.cc",
-  ]
-
-  deps = [
-    ":content",
-    "//base",
-    "//base/test:test_support",
-    "//components/offline_pages/core",
-    "//components/offline_pages/core:test_support",
-    "//content/test:test_support",
-    "//testing/gtest",
-    "//url",
-  ]
-}