Use webview in web activity

athena/main/placeholder_content.cc

-// 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.
-
-#include "athena/main/placeholder_content.h"
-
-#include "athena/activity/public/activity_factory.h"
-#include "athena/activity/public/activity_manager.h"
-
-void CreateTestPages(content::BrowserContext* browser_context) {
-  const char* kTestURLs[] = {
-      "http://cyan.bikeshed.com", "https://news.google.com",
-      "http://blue.bikeshed.com", "https://www.google.com",
-  };
-  for (size_t i = 0; i < arraysize(kTestURLs); ++i) {
-    athena::ActivityManager::Get()->AddActivity(
-        athena::ActivityFactory::Get()->CreateWebActivity(
-            browser_context, GURL(kTestURLs[i])));
-  }
-}