Don't instantiate ContentSuggestionsService on non-Android

chrome/browser/ntp_snippets/content_suggestions_service_factory_browsertest.cc

Index: chrome/browser/ntp_snippets/content_suggestions_service_factory_browsertest.cc
diff --git a/chrome/browser/ntp_snippets/content_suggestions_service_factory_browsertest.cc b/chrome/browser/ntp_snippets/content_suggestions_service_factory_browsertest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4878af5e305610373728ec208c3f65d185704f2d
--- /dev/null
+++ b/chrome/browser/ntp_snippets/content_suggestions_service_factory_browsertest.cc
@@ -0,0 +1,22 @@
+// Copyright 2017 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.
+
+#include "chrome/browser/ntp_snippets/content_suggestions_service_factory.h"
+
+#include "chrome/browser/ui/browser.h"
+#include "chrome/test/base/in_process_browser_test.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using ContentSuggestionsServiceFactoryTest = InProcessBrowserTest;
+
+IN_PROC_BROWSER_TEST_F(ContentSuggestionsServiceFactoryTest,
+                       CreatesServiceOnlyOnAndroid) {
+  ntp_snippets::ContentSuggestionsService* service =
+      ContentSuggestionsServiceFactory::GetForProfile(browser()->profile());
+#if defined(OS_ANDROID)
+  EXPECT_TRUE(service);
+#else
+  EXPECT_FALSE(service);
+#endif
+}